ci: Add prettier check

.github/workflows/lint.yaml

@@ -17,6 +17,17 @@ jobs:
         run: |
           npx eclint check .
 
+  prettier:
+    name: Lint frontend with prettier
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run prettier
+        working-directory: src/frontend
+        run: |
+          npx prettier --check .
+
   eslint:
     name: Lint frontend with eslint
     runs-on: ubuntu-latest