ci: Setup gitflow process

.github/workflows/build.yml

@@ -2,7 +2,7 @@ name: 'Build & Test'
 on:
   push:
     branches:
-      - master
+      - develop
       - release/**
   pull_request:
   workflow_dispatch:
@@ -42,11 +42,11 @@ env:
 
   # GH will use the first restore-key it finds that matches
   # So it will start by looking for one from the same branch, else take the newest one it can find elsewhere
-  # We want to prefer the cache from the current master branch, if we don't find any on the current branch
+  # We want to prefer the cache from the current develop branch, if we don't find any on the current branch
   NX_CACHE_RESTORE_KEYS: |
     nx-Linux-${{ github.ref }}-${{ github.event.inputs.commit || github.sha }}
     nx-Linux-${{ github.ref }}
-    nx-Linux-refs/heads/master
+    nx-Linux-refs/heads/develop
     nx-Linux
 
 jobs:
@@ -134,7 +134,7 @@ jobs:
       changed_browser_integration: ${{ steps.changed.outputs.browser_integration }}
       changed_any_code: ${{ steps.changed.outputs.any_code }}
       # Note: These next three have to be checked as strings ('true'/'false')!
-      is_master: ${{ github.ref == 'refs/heads/master' }}
+      is_develop: ${{ github.ref == 'refs/heads/develop' }}
       is_release: ${{ startsWith(github.ref, 'refs/heads/release/') }}
       force_skip_cache:
         ${{ github.event_name == 'pull_request' && contains(steps.pr-labels.outputs.labels, ' ci-skip-cache ') }}
@@ -202,7 +202,7 @@ jobs:
       - name: NX cache
         uses: actions/cache@v3
         # Disable cache when:
-        # - on master
+        # - on develop
         # - on release branches
         # - when PR has `ci-skip-cache` label
         if: |
@@ -211,9 +211,9 @@ jobs:
         with:
           path: node_modules/.cache/nx
           key: nx-Linux-${{ github.ref }}-${{ env.HEAD_COMMIT }}
-          # On master branch, we want to _store_ the cache (so it can be used by other branches), but never _restore_ from it
+          # On develop branch, we want to _store_ the cache (so it can be used by other branches), but never _restore_ from it
           restore-keys:
-            ${{needs.job_get_metadata.outputs.is_master == 'false' && env.NX_CACHE_RESTORE_KEYS || 'nx-never-restore'}}
+            ${{needs.job_get_metadata.outputs.is_develop == 'false' && env.NX_CACHE_RESTORE_KEYS || 'nx-never-restore'}}
 
       - name: Build packages
         # Under normal circumstances, using the git SHA as a cache key, there shouldn't ever be a cache hit on the built
@@ -272,8 +272,7 @@ jobs:
     needs: [job_get_metadata, job_build]
     timeout-minutes: 15
     runs-on: ubuntu-20.04
-    # Size Check will error out outside of the context of a PR or master branch
-    if: github.event_name == 'pull_request' || needs.job_get_metadata.outputs.is_master == 'true'
+    if: github.event_name == 'pull_request' || needs.job_get_metadata.outputs.is_develop == 'true'
     steps:
       - name: Check out current commit (${{ needs.job_get_metadata.outputs.commit_label }})
         uses: actions/checkout@v3
@@ -283,7 +282,6 @@ jobs:
         uses: actions/setup-node@v3
         with:
           # The size limit action runs `yarn` and `yarn build` when this job is executed on
-          # `master`. We can't change this without making changes to the action, so we'll
           # use Node 14 for now.
           node-version: '14'
       - name: Check dependency cache
@@ -301,6 +299,7 @@ jobs:
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           skip_step: build
+          main_branch: develop
 
   job_lint:
     name: Lint

.github/workflows/codeql-analysis.yml

@@ -13,10 +13,10 @@ name: 'CodeQL'
 
 on:
   push:
-    branches: [master]
+    branches: [develop]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [master]
+    branches: [develop]
     paths-ignore:
       # When _only_ changing .md files, no need to run CodeQL analysis
       - '**/*.md'

.github/workflows/enforce-license-compliance.yml

@@ -2,9 +2,9 @@ name: Enforce License Compliance
 
 on:
   push:
-    branches: [master, main, release/*]
+    branches: [master, develop, release/*]
   pull_request:
-    branches: [master, main]
+    branches: [master, develop]
 
 jobs:
   enforce-license-compliance:

.github/workflows/gitflow-sync-develop.yml

@@ -0,0 +1,50 @@
+name: Gitflow - Sync master into develop
+on:
+  push:
+    branches:
+      - master
+    paths:
+      # When the version is updated on master (but nothing else)
+      - 'lerna.json'
+      - '!**/*.js'
+      - '!**/*.ts'
+  workflow_dispatch:
+
+env:
+  DEV_BRANCH: develop
+
+jobs:
+  main:
+    name: Create PR master->develop
+    runs-on: ubuntu-20.04
+    permissions:
+      pull-requests: write
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v3
+
+      # https://github.com/marketplace/actions/github-pull-request-action
+      - name: Create Pull Request
+        id: open-pr
+        uses: repo-sync/pull-request@v2
+        with:
+          destination_branch: ${{ env.DEV_BRANCH }}
+          pr_title: '[Gitflow] Merge ${{ github.ref_name }} into ${{ env.DEV_BRANCH }}'
+          pr_body: 'Merge ${{ github.ref_name }} branch into ${{ env.DEV_BRANCH }}'
+
+      # https://github.com/marketplace/actions/enable-pull-request-automerge
+      - name: Enable automerge for PR
+        if: steps.open-pr.outputs.pr_number != ''
+        uses: peter-evans/enable-pull-request-automerge@v2
+        with:
+          pull-request-number: ${{ steps.open-pr.outputs.pr_number }}
+          merge-method: merge
+
+      # https://github.com/marketplace/actions/auto-approve
+      - name: Auto approve PR
+        uses: hmarr/auto-approve-action@v3
+        with:
+          pull-request-number: ${{ steps.open-pr.outputs.pr_number }}
+          review-message: 'Auto approved automated PR'
+          # TODO: Use the token of some user here??
+          # github-token: ${{ secrets.SOME_USERS_PAT }}

.github/workflows/gitflow-sync-master.yml

@@ -0,0 +1,52 @@
+name: Gitflow - Sync develop into master
+on:
+  push:
+    branches:
+      - develop
+    paths:
+      # We want to trigger this when ONLY the changlog is changed on develop, but nothing else
+      - 'CHANGELOG.md'
+      - '!packages'
+      - '!**/*.js'
+      - '!**/*.json'
+      - '!**/*.ts'
+  workflow_dispatch:
+
+env:
+  MAIN_BRANCH: master
+
+jobs:
+  main:
+    name: Create PR develop->master
+    runs-on: ubuntu-20.04
+    permissions:
+      pull-requests: write
+    steps:
+      - name: git checkout
+        uses: actions/checkout@v3
+
+      # https://github.com/marketplace/actions/github-pull-request-action
+      - name: Create Pull Request
+        id: open-pr
+        uses: repo-sync/pull-request@v2
+        with:
+          destination_branch: ${{ env.MAIN_BRANCH }}
+          pr_title: '[Gitflow] Merge ${{ github.ref_name }} into ${{ env.MAIN_BRANCH }}'
+          pr_body: 'Merge ${{ github.ref_name }} branch into ${{ env.MAIN_BRANCH }}'
+
+      # https://github.com/marketplace/actions/enable-pull-request-automerge
+      - name: Enable automerge for PR
+        if: steps.open-pr.outputs.pr_number != ''
+        uses: peter-evans/enable-pull-request-automerge@v2
+        with:
+          pull-request-number: ${{ steps.open-pr.outputs.pr_number }}
+          merge-method: merge
+
+      # https://github.com/marketplace/actions/auto-approve
+      - name: Auto approve PR
+        uses: hmarr/auto-approve-action@v3
+        with:
+          pull-request-number: ${{ steps.open-pr.outputs.pr_number }}
+          review-message: 'Auto approved automated PR'
+          # TODO: Use the token of some user here??
+          # github-token: ${{ secrets.SOME_USERS_PAT }}

.github/workflows/release.yml

@@ -11,6 +11,7 @@ on:
       merge_target:
         description: Target branch to merge into. Uses the default branch as a fallback (optional)
         required: false
+        default: master
 jobs:
   release:
     runs-on: ubuntu-20.04

CONTRIBUTING.md

@@ -130,25 +130,14 @@ This means that all commits on the branch will be squashed into a single commit,
 * Make sure to rebase the branch on `master` before squashing it
 * Make sure to update the commit message of the squashed branch to follow the commit guidelines - including the PR number
 
-## Publishing a Release
+### Gitflow
 
-_These steps are only relevant to Sentry employees when preparing and publishing a new SDK release._
+We use [Gitflow](https://docs.github.com/en/get-started/quickstart/github-flow) as a branching model.
 
-**If you want to release a new SDK for the first time, be sure to follow the [New SDK Release Checklist](./docs/new-sdk-release-checklist.md)**
+For more details, [see our Gitflow docs](./docs/gitflow.md).
 
-1. Determine what version will be released (we use [semver](https://semver.org)).
-2. Update [`CHANGELOG.md`](https://github.com/getsentry/sentry-javascript/edit/master/CHANGELOG.md) to add an entry for the next release number and a list of changes since the last release. (See details below.)
-3. Run the [Prepare Release](https://github.com/getsentry/sentry-javascript/actions/workflows/release.yml) workflow.
-4. A new issue should appear in https://github.com/getsentry/publish/issues.
-5. Ask a member of the [@getsentry/releases team](https://github.com/orgs/getsentry/teams/releases/members) to approve the release.
+## Publishing a Release
 
-### Updating the Changelog
+_These steps are only relevant to Sentry employees when preparing and publishing a new SDK release._
 
-1. Create a new branch.
-2. Run `git log --format="- %s"` and copy everything since the last release.
-3. Create a new section in the changelog, deciding based on the changes whether it should be a minor bump or a patch release.
-4. Paste in the logs you copied earlier.
-5. Delete any which aren't user-facing changes.
-6. Alphabetize the rest.
-7. If any of the PRs are from external contributors, include underneath the commits `Work in this release contributed by <list of external contributors' GitHub usernames>. Thank you for your contributions!`. If there's only one external PR, don't forget to remove the final `s`. If there are three or more, use an Oxford comma. (It's in the Sentry styleguide!)
-8. Commit, push, and open a PR with the title `meta: Update changelog for <fill in relevant version here>`.
+[See the docs for publishing a release](./docs/publishing-a-release.md)

docs/gitflow.md

@@ -0,0 +1,13 @@
+# Gitflow
+
+We use [Gitflow](https://docs.github.com/en/get-started/quickstart/github-flow) as a branching model.
+
+## Summary
+
+* Ongoing work happens on the `develop` branch
+* Any PRs (features, ...) are implemented as PRs against `develop`
+* When we are ready to release, we merge develop into master, create a release there, then merge master back into develop
+* Whatever is currently on `master` can be considered the last released state of the SDK
+* Never merge directly into `master` (unless we want e.g. an emergency bugfix release)
+
+![gitflow-chart](./assets/gitflow-chart.png)

docs/publishing-a-release.md

@@ -0,0 +1,26 @@
+
+# Publishing a Release
+
+_These steps are only relevant to Sentry employees when preparing and publishing a new SDK release._
+
+**If you want to release a new SDK for the first time, be sure to follow the [New SDK Release Checklist](./new-sdk-release-checklist.md)**
+
+1. Determine what version will be released (we use [semver](https://semver.org)).
+2. Update [`CHANGELOG.md`](https://github.com/getsentry/sentry-javascript/edit/master/CHANGELOG.md) to add an entry for the next release number and a list of changes since the last release. (See details below.)
+  a. Merging the Changelog PR will automatically trigger a sync from `develop` -> `master`
+3. Run the [Prepare Release](https://github.com/getsentry/sentry-javascript/actions/workflows/release.yml) workflow.
+  a. Wait for this until the sync to `master` is completed.
+4. A new issue should appear in https://github.com/getsentry/publish/issues.
+5. Ask a member of the [@getsentry/releases team](https://github.com/orgs/getsentry/teams/releases/members) to approve the release.
+  a. Once the release is completed, a sync from `master` ->` develop` will be automatically triggered
+
+## Updating the Changelog
+
+1. Create a new branch.
+2. Run `git log --format="- %s"` and copy everything since the last release.
+3. Create a new section in the changelog, deciding based on the changes whether it should be a minor bump or a patch release.
+4. Paste in the logs you copied earlier.
+5. Delete any which aren't user-facing changes.
+6. Alphabetize the rest.
+7. If any of the PRs are from external contributors, include underneath the commits `Work in this release contributed by <list of external contributors' GitHub usernames>. Thank you for your contributions!`. If there's only one external PR, don't forget to remove the final `s`. If there are three or more, use an Oxford comma. (It's in the Sentry styleguide!)
+8. Commit, push, and open a PR with the title `meta: Update changelog for <fill in relevant version here>` against `develop` branch.