Automatically add internal labels

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

@@ -12,4 +12,16 @@ jobs:
           pull-requests: write
 
         steps:
-          # Todo
+          # If PR title starts with "Internal: " then add the "Internal" label
+          - name: Label Internal Pull Requests
+            if: "startsWith(github.event.pull_request.title, 'Internal: ')"
+            uses: actions/github-script@v7
+            with:
+              github-token: ${{ secrets.GITHUB_TOKEN }}
+              script: |
+                github.rest.issues.addLabels({
+                    issue_number: context.issue.number,
+                    owner: context.repo.owner,
+                    repo: context.repo.repo,
+                    labels: ['Internal']
+                })