ci: add PR title check (#52)

Author: MattDevy

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @MattDevy

.github/workflows/ci.yml

@@ -35,6 +35,20 @@ jobs:
       - name: Run tests
         run: npm test
 
+  pr-title:
+    name: PR Title
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+
+    permissions:
+      pull-requests: read
+
+    steps:
+      - name: Validate PR title
+        uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   megalinter:
     name: Lint
     runs-on: ubuntu-latest