workflow: add frontend build and linter check to GitHub Actions

Author: nico97118

.github/workflows/frontend-build.yaml

@@ -0,0 +1,33 @@
+name: Frontend Build Check
+
+on:
+  pull_request:
+    paths:
+      - 'custom_components/alarmo/frontend/**'
+  push:
+    paths:
+      - 'custom_components/alarmo/frontend/**'
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '24'
+
+      - name: Install dependencies
+        working-directory: custom_components/alarmo/frontend
+        run: npm install
+
+      - name: Run linter check
+        working-directory: custom_components/alarmo/frontend
+        run: npm run lint:check
+
+      - name: Build frontend
+        working-directory: custom_components/alarmo/frontend
+        run: npm run build

custom_components/alarmo/frontend/package.json

@@ -9,6 +9,7 @@
     "rollup": "rollup -c",
     "babel": "./node_modules/.bin/babel dist/alarm-panel.js --out-file dist/alarm-panel.js",
     "lint": "eslint src/**/*.ts --fix",
+    "lint:check": "eslint src/**/*.ts",
     "start": "rollup -c --watch"
   },
   "repository": {