feat: Adding pull request workflow.

This is part of making the main branch protected.

.github/workflows/pull_request.yml

@@ -0,0 +1,16 @@
+---
+on: [pull_request]
+
+jobs:
+  cog_check_job:
+    runs-on: ubuntu-latest
+    name: check conventional commit compliance
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          # pick the pr HEAD instead of the merge commit
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Conventional commit check
+        uses: cocogitto/cocogitto-action@v3