ci: run lint before frontend build

Co-authored-by: naiba/CloudCode <hi+cloudcode@nai.ba>

.github/workflows/frontend-ci.yml

@@ -27,6 +27,9 @@ jobs:
             - name: Install dependencies
               run: npm ci
 
+            - name: Run lint
+              run: npm run lint
+
             - name: Build frontend
               run: npm run build