ci: add check for PR titles with specific phrases (airbytehq#636)

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Aaron <AJ> Steers <aj@airbyte.io>

Author: devin-ai-integration[bot]

.github/workflows/semantic_pr_check.yml

@@ -47,3 +47,13 @@ jobs:
           # scopes: |
           #   core
           #   ui
+
+      - name: Check for "do not merge" in PR title
+        if: ${{ github.event.pull_request.draft == false }}
+        uses: actions/github-script@v6
+        with:
+          script: |
+            const title = context.payload.pull_request.title.toLowerCase();
+            if (title.includes('do not merge') || title.includes('do-not-merge')) {
+              core.setFailed('PR title contains "do not merge" or "do-not-merge". Please remove this before merging.');
+            }