Testing single-commit action

Author: rohennes

.github/workflows/check-single-commit.yml

@@ -0,0 +1,30 @@
+name: Test Single Commit
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  check-single-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Count commits
+        id: commits
+        run: |
+          BASE_BRANCH="${{ github.event.pull_request.base.ref }}"
+          COMMIT_COUNT=$(git rev-list --count --no-merges origin/$BASE_BRANCH..HEAD)
+          echo "count=$COMMIT_COUNT" >> $GITHUB_OUTPUT
+
+      - name: Enforce single commit
+        run: |
+          if [ "${{ steps.commits.outputs.count }}" -gt 1 ]; then
+            echo "❌ PR has more than one commit (${{ steps.commits.outputs.count }} commits)."
+            exit 1
+          else
+            echo "✅ PR has 1 commit."
+          fi