Add linter

.gitea/workflows/demo.yaml

@@ -4,7 +4,17 @@ run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
 on: [push]
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    permissions:
+      checks: write
+      contents: write
+    steps:
+      - name: Standard Ruby
+        uses: standardrb/standard-ruby-action@v1
+
   test:
+    needs: link
     runs-on: ubuntu-latest
     steps:
       - name: Checkout