chore: add format workflow (#15)

.github/workflows/format.yml

@@ -0,0 +1,44 @@
+name: 👔 Format
+
+on:
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  format:
+    if: github.repository == 'remix-run/release-comment-action'
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: ⬇️ Checkout repo
+        uses: actions/checkout@v3
+
+      - name: 🟧 Setup pnpm
+        uses: pnpm/action-setup@v2
+        with:
+          version: 8
+          run_install: |
+            - recursive: true
+              args: [--frozen-lockfile, --strict-peer-dependencies]
+
+      - name: 👔 Format
+        run: pnpm run format
+
+      - name: 💪 Commit
+        run: |
+          git config --local user.email "github-actions[bot]@users.noreply.github.com"
+          git config --local user.name "github-actions[bot]"
+
+          git add .
+          if [ -z "$(git status --porcelain)" ]; then
+            echo "💿 no formatting changed"
+            exit 0
+          fi
+          git commit -m "chore: format"
+          git push
+          echo "💿 pushed formatting changes https://github.com/$GITHUB_REPOSITORY/commit/$(git rev-parse HEAD)"