ci: Add PR title linter following conventional commits

See https://www.conventionalcommits.org/en/v1.0.0/

Follow-on to #86

Author: kadler

.github/workflows/semantic-pull-requests.yml

@@ -0,0 +1,15 @@
+name: "Lint PR"
+on:
+  pull_request:
+    types:
+      - opened
+      - edited
+      - synchronize
+
+jobs:
+  main:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: amannn/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}