Run release action only on the main branch, Fixes #9

.github/workflows/release.yml

@@ -7,27 +7,46 @@ on:  # yamllint disable-line rule:truthy
   workflow_dispatch: {}
 
 jobs:
+  check-current-branch:
+    runs-on: 'ubuntu-latest'
+    outputs:
+      branch: '${{ steps.check_step.outputs.branch }}'
+    steps:
+      - name: 'Checkout'
+        uses: 'actions/checkout@v4'
+        with:
+          fetch-depth: 0
+
+      - name: 'Determine current branch'
+        id: 'check_step'
+        # 1. Get the list of branches ref where this tag exists
+        # 2. Remove 'origin/' from that result
+        # 3. Put that string in output
+        run: |
+          raw=$(git branch -r --contains ${{ github.ref }})
+          branch="$(echo ${raw//origin\//} | tr -d '\n')"
+          echo "{name}=branch" >> $GITHUB_OUTPUT
+          echo "Branches where this tag exists : $branch."
+
   build:
     name: 'Publish to Ansible Galaxy'
     runs-on: 'ubuntu-latest'
+    needs: 'check-current-branch'
     steps:
       - name: 'checkout'
         uses: 'actions/checkout@v4'
-        if: >-
-          github.ref == 'refs/heads/main'
+        if: "contains(${{ needs.check.outputs.branch }}, 'main')"
 
       - name: 'galaxy'
         uses: 'robertdebock/[email protected]'
-        if: >-
-          github.ref == 'refs/heads/main'
+        if: "contains(${{ needs.check.outputs.branch }}, 'main')"
         with:
           galaxy_api_key: '${{ secrets.galaxy_api_key }}'
           git_branch: 'main'
 
       - name: 'Create a new release on GitHub'
         uses: 'softprops/action-gh-release@v2'
-        if: >-
-          github.ref == 'refs/heads/main'
+        if: "contains(${{ needs.check.outputs.branch }}, 'main')"
         with:
           draft: false
           prerelease: false