chore: adding leak detect (#492)

Author: SamuelBellomo

.github/workflows/leak_detect.yml

@@ -0,0 +1,40 @@
+name: Detect Project ID leak
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  push:
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  check:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - name: Checkout github repo (+ download lfs dependencies)
+        # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+        uses: actions/checkout@v2
+        with:
+          lfs: true
+      - name: Checkout LFS objects # needs to be done as a second step, lfs:true above just sets references, but doesn't actually dereference them...
+        run: git lfs checkout
+      # Find in project settings if there's any value in between "cloudProjectId: " and end of line. This exits 1 and fails the step if there's text there.
+      - name: Run a one-line script
+        run: python3 -c "import re; import sys;content=open('ProjectSettings/ProjectSettings.asset').read();res = re.search(r'.*cloudProjectId:.*\w+\s*\n', content)!=None;status = 1 if res else 0; print('status '+str(status)); sys.exit(res)"
+      - name: Post to slack on failure
+        if: ${{ failure() }}
+        uses: slackapi/[email protected]
+        with:
+            # Slack channel id, channel name, or user id to post message.
+            # See also: https://api.slack.com/methods/chat.postMessage#channels
+            channel-id: 'G01H7JP4AP2' # private channel
+            # For posting a simple plain text message
+            slack-message: "Project ID LEAK DETECTED: ${{ job.status }}\n${{ github.event.pull_request.html_url || github.event.head_commit.url }}"
+        env:
+            SLACK_BOT_TOKEN: ${{ secrets.SLACK_BOT_TOKEN }} # can be found in https://api.slack.com/apps/