Add action that ensures the node test is downloaded from node's repo

.github/workflows/codex-test-sync.yml

@@ -0,0 +1,45 @@
+name: Codex Test Sync
+
+on:
+  pull_request:
+    types: [labeled, opened]
+
+env:
+  BUN_VERSION: "canary"
+
+jobs:
+  sync-node-tests:
+    runs-on: ubuntu-latest
+    if: |
+      (github.event.action == 'labeled' && github.event.label.name == 'codex') ||
+      (github.event.action == 'opened' && contains(github.event.pull_request.labels.*.name, 'codex'))
+    permissions:
+      contents: write
+      pull-requests: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          fetch-depth: 0
+
+      - name: Setup Bun
+        uses: ./.github/actions/setup-bun
+        with:
+          bun-version: ${{ env.BUN_VERSION }}
+
+      - name: Get changed files and sync tests
+        run: |
+          # Get the list of changed files from the PR
+          git diff --name-only origin/main...HEAD | while read -r file; do
+            if [[ "$file" =~ ^test/js/node/test/(parallel|sequential)/(.+)\.js$ ]]; then
+              test_name="${BASH_REMATCH[2]}"
+              echo "Syncing test: $test_name"
+              bun node:test:cp "$test_name"
+            fi
+          done
+
+      - name: Commit changes
+        uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: "Sync Node.js tests with upstream"