chore: vale on changed files

.github/workflows/style.yml

@@ -1,13 +1,24 @@
 name: Vale
 on:
-  push:
+  pull_request:
 
 jobs:
   vale:
     name: runner / vale
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
+
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v45
+
+      - name: Echo changed files
+        run: |
+          echo "Changed files:"
+          echo "${{ steps.changed-files.outputs.all_changed_files }}"
+
       - uses: errata-ai/vale-action@reviewdog
         with:
+          files: ${{ steps.changed-files.outputs.all_changed_files }}
           reporter: github-check