feat: add frontend linting job to GitHub Actions workflow

.github/workflows/build.yml

@@ -9,6 +9,27 @@ on:
     types: [submitted]
 
 jobs:
+  frontend-lint:
+    runs-on: buildjet-4vcpu-ubuntu-2204
+    name: Lint
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: v21.1.0
+          cache: "npm"
+          cache-dependency-path: "ui/package-lock.json"
+      - name: Install dependencies
+        run: |
+          cd ui
+          npm ci
+      - name: Lint frontend
+        run: |
+          cd ui
+          npm run lint
+
   build:
     runs-on: buildjet-4vcpu-ubuntu-2204
     name: Build
@@ -19,12 +40,12 @@ jobs:
         uses: actions/setup-node@v4
         with:
           node-version: v21.1.0
-          cache: 'npm'
-          cache-dependency-path: '**/package-lock.json'
+          cache: "npm"
+          cache-dependency-path: "**/package-lock.json"
       - name: Set up Golang
         uses: actions/setup-go@v4
         with:
-          go-version: '1.24.0'
+          go-version: "1.24.0"
       - name: Build frontend
         run: |
           make frontend