Use reviewdog to suggest rustfmt diff

.github/workflows/rustfmt.yml

@@ -6,6 +6,13 @@ on:
  pull_request:
  workflow_dispatch:
 
+# https://github.com/reviewdog/action-suggester?tab=readme-ov-file#required-permissions
+permissions:
+ contents: read
+ checks: write
+ issues: write
+ pull-requests: write
+
 jobs:
  rustfmt:
  name: Rustfmt Check
@@ -18,4 +25,10 @@ jobs:
  with:
  components: rustfmt
  - name: Rustfmt check
- run: cargo fmt -- --check -v
+ run: cargo fmt -- -v ${{ github.event_name == 'pull_request' && '' || '--check' }}
+ - name: Suggest changes
+ if: ${{ github.event_name == 'pull_request' }}
+ uses: reviewdog/action-suggester@v1
+ with:
+ tool_name: rustfmt
+ fail_on_error: true