Merge pull request #925 from lsst-it/IT-6159/block_merge_commits

(gha) add block merge commits workflow

Author: jhoblitt

.github/workflows/block_merge_commits.yaml

@@ -0,0 +1,24 @@
+---
+# yamllint disable rule:quoted-strings
+name: Block Merge Commits
+
+"on": pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref_name }}
+  cancel-in-progress: true
+
+jobs:
+  message-check:
+    name: Block Merge Commits
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Block Merge Commits
+        uses: Morishiri/[email protected]
+        with:
+          repo-token: "${{ secrets.GITHUB_TOKEN }}"