Use matrix job to merge main into branches

Consolidate duplicate merge jobs into a single matrix job that runs for 'dev' and 'release', reducing duplication and making it easy to add more branches. Rename workflow to "Merge Main to branches" and remove the concurrency block. Improve logging and behavior: missing branches are now skipped (exit 0) instead of failing, merge commit messages include the target branch, and error messages are clearer. Keeps write permissions and full checkout depth.

Author: mercyblitz

.github/workflows/merge-main-to-branches.yml

@@ -1,47 +1,20 @@
 # This workflow automatically merges the 'main' branch into 'dev' and 'release' branches
 # whenever changes are pushed to 'main', without requiring manual confirmation.
 
-name: Merge Main to Dev and Release
+name: Merge Main to branches
 
 on:
   push:
     branches:
       - main
 
-concurrency:
-  group: merge-main-to-branches
-  cancel-in-progress: false
-
 jobs:
-  merge-to-dev:
-    name: Merge main → dev
-    runs-on: ubuntu-latest
-    permissions:
-      contents: write
-    steps:
-      - name: Checkout Repository
-        uses: actions/checkout@v5
-        with:
-          fetch-depth: 0
-          token: ${{ secrets.GITHUB_TOKEN }}
-
-      - name: Merge main into dev
-        run: |
-          git config user.name "github-actions[bot]"
-          git config user.email "github-actions[bot]@users.noreply.github.com"
-          if ! git checkout dev; then
-            echo "::error::Branch 'dev' does not exist. Skipping merge."
-            exit 1
-          fi
-          if ! git merge --no-ff origin/main -m "chore: merge main into dev [skip ci]"; then
-            echo "::error::Merge conflict detected when merging main into dev. Manual intervention required."
-            exit 1
-          fi
-          git push origin dev
-
-  merge-to-release:
-    name: Merge main → release
+  merge-to-branch:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        branch: [ 'dev', 'release' ]
+    name: main -> ${{ matrix.branch }}
     permissions:
       contents: write
     steps:
@@ -51,16 +24,16 @@ jobs:
           fetch-depth: 0
           token: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Merge main into release
+      - name: Merge main into ${{ matrix.branch }}
         run: |
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
-          if ! git checkout release; then
-            echo "::error::Branch 'release' does not exist. Skipping merge."
-            exit 1
+          if ! git checkout ${{ matrix.branch }}; then
+            echo "[INFO] Branch '${{ matrix.branch }}' does not exist. Skipping merge."
+            exit 0
           fi
-          if ! git merge --no-ff origin/main -m "chore: merge main into release [skip ci]"; then
-            echo "::error::Merge conflict detected when merging main into release. Manual intervention required."
+          if ! git merge --no-ff origin/main -m "chore: merge main into ${{ matrix.branch }} [skip ci]"; then
+            echo "[ERROR] Merge conflict detected when merging main into ${{ matrix.branch }}. Manual intervention required."
             exit 1
           fi
-          git push origin release
+          git push origin ${{ matrix.branch }}