ci: require semantic PR titles (#45)

Author: jackgerrits

.github/workflows/check_pr_title.yml

@@ -0,0 +1,28 @@
+name: Require semantic PR title
+
+on:
+  pull_request_target:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+concurrency: 
+  group: ${{ github.workflow }}-${{ github.head_ref || github.sha }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      # Accepted types: https://github.com/commitizen/conventional-commit-types/blob/master/index.json
+      - uses: amannn/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          # Reason from action docs:
+          # When using "Squash and merge" on a PR with only one commit, GitHub
+          # will suggest using that commit message instead of the PR title for the
+          # merge commit, and it's easy to commit this by mistake. Enable this option
+          # to also validate the commit message for one commit PRs.
+          validateSingleCommit: true