Add action

.github/workflows/pronto.yml

@@ -0,0 +1,16 @@
+name: Pronto
+
+on:
+  - pull_request
+
+jobs:
+  run:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: git fetch origin main --depth=0
+      - uses: renatolond/pronto-ruby@v4.0-r
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          target: origin/main