[CSA-CP] Restore restyler automation (#273)

Co-authored-by: Andrei Litvin <andy314@gmail.com>
Co-authored-by: Andrei Litvin <andreilitvin@google.com>
Co-authored-by: Yufeng Wang <yufengwang@google.com>

Author: 4 people

.github/workflows/restyled.yml

@@ -0,0 +1,41 @@
+name: Restyled
+
+on:
+  pull_request:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  restyled:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - uses: restyled-io/actions/setup@v4
+        with:
+          # TODO: Pinned to v0.6.0.2 because the latest release does not have a pre-built
+          # 'restyler-linux' asset. This broke our workflow as we rely on the pre-built binary.
+          # Remove this pin once a new release with the 'restyler-linux' asset is available.          
+          tag: 'v0.6.0.2'
+
+      - id: restyler
+        uses: restyled-io/actions/run@v4
+        with:
+          fail-on-differences: true
+
+      - if: |
+          !cancelled() &&
+          steps.restyler.outputs.success == 'true' &&
+          github.event.pull_request.head.repo.full_name == github.repository
+        uses: peter-evans/create-pull-request@v6
+        with:
+          base: ${{ steps.restyler.outputs.restyled-base }}
+          branch: ${{ steps.restyler.outputs.restyled-head }}
+          title: ${{ steps.restyler.outputs.restyled-title }}
+          body: ${{ steps.restyler.outputs.restyled-body }}
+          labels: "restyled"
+          reviewers: ${{ github.event.pull_request.user.login }}
+          delete-branch: true