Add workflow for updating VS Code

For now it is manually triggered.

.github/workflows/update.yaml

@@ -0,0 +1,36 @@
+name: Update code-server
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        type: string
+        required: true
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    env:
+      VERSION: ${{ inputs.version }}
+      GH_TOKEN: ${{ secrets.HOMEBREW_GITHUB_API_TOKEN }}
+
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
+        with:
+          node-version-file: .node-version
+
+      - run: ./ci/build/update-vscode.sh
+
+      - name: Open PR
+        run: |
+          git config --global user.name cdrci
+          git config --global user.email opensource@coder.com
+          git checkout -b update/${{ env.VERSION }}
+          git add .
+          git commit -m "Update VS Code to ${{ env.VERSION }}"
+          git push -u origin $(git branch --show)
+          gh pr create --repo coder/code-server-aur \
+            --title "Update VS Code to ${{ env.VERSION }}" \
+            --body-file .cache/checklist \
+            --draft