ci: 🎡 add checkout job and concurrency to publish workflow

.github/workflows/publish.yml

@@ -8,12 +8,16 @@ on:
   workflow_dispatch:
 
 jobs:
-  verify_branch:
+  publish:
     runs-on: ubuntu-latest
     if: github.event.pull_request.merged == true && github.event.pull_request.head.ref == ${{ vars.RELEASE_PR_BRANCH || 'create-pull-request/patch' }}
+    concurrency: publish
     outputs:
       should-publish:
     steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
       - name: Publish to GitHub Releases
         if: github.event_name == 'workflow_dispatch'
         uses: python-semantic-release/upload-to-gh-release@main