👷 ci(workflow): add lint job to build workflow

- introduce lint job in build.yml for code quality checks
- ensure lint job runs before docker job
- setup Node.js and install dependencies for ESLint

.forgejo/workflows/build.yml

@@ -6,7 +6,22 @@ on:
       - main
 
 jobs:
+  lint:
+    runs-on: self-hosted
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+      - name: Install dependencies
+        run: npm ci
+      - name: Run ESLint
+        run: npm run lint
+
   docker:
+    needs: lint
     runs-on: self-hosted
     steps:
       - name: Set up Docker Buildx