Add job to create a GitHub release

Author: dlarocque

.github/workflows/release-prod.yml

@@ -124,3 +124,28 @@ jobs:
         curl -X POST -H "Content-Type:application/json" \
         -d "{\"version\":\"$BASE_VERSION\",\"date\":\"$DATE\"}" \
         $RELEASE_TRACKER_URL/logProduction
+    - name: Create Github release
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        # Get the newest release tag for the firebase package (e.g. [email protected])
+        NEWEST_TAG=$(git describe --tags --match "firebase@[0-9]*.[0-9]*.[0-9]*" --abbrev=0)
+
+        # Get the release notes from the description of the most recent merged PR into the "release" branch
+        # See: https://github.com/firebase/firebase-js-sdk/pull/8236
+        RELEASE_NOTES=$(gh pr list \
+          --repo "$GITHUB_REPOSITORY" \
+          --state "merged" \
+          --base "release" \
+          --limit 1 \
+          --json "body" \
+          | jq '.[].body'\
+          | jq -r . \
+          | sed '1,/^# Releases/d')
+
+        # Create the GitHub release
+        gh release create "$NEWEST_TAG" \
+            --repo="$GITHUB_REPOSITORY" \
+            --title="$NEWEST_TAG" \
+            --notes "$RELEASE_NOTES" \
+            --verify-tag