CI: Add eslint step

No need to add it explicitly, it's automatically executed by `yarn
build` if the dependencies are satisfied.

Also simplify github actions

Author: BenediktSeidl

.github/workflows/ci.yml

@@ -0,0 +1,21 @@
+name: CI
+
+on:
+  push:
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Node.js environment
+        uses: actions/setup-node@v3
+        with:
+          node-version: '14'
+          cache: 'yarn'
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+      - name: Build and test frontend
+        run: yarn build

.github/workflows/node.js.yml

@@ -17,7 +17,16 @@
     "@grafana/runtime": "^9.0.4",
     "@grafana/toolkit": "^9.0.4",
     "@grafana/ui": "^9.0.4",
-    "@types/lodash": "4.14.182"
+    "@types/lodash": "4.14.182",
+    "@testing-library/jest-dom": "5.16.4",
+    "@testing-library/react": "^12.1.5",
+    "eslint": "^8.19.0",
+    "@typescript-eslint/eslint-plugin": "^5.30.6",
+    "eslint-plugin-react": "^7.30.1",
+    "eslint-plugin-react-hooks": "^4.6.0",
+    "@typescript-eslint/parser": "^5.33.0",
+    "@grafana/eslint-config": "^5.0.0",
+    "eslint-plugin-jsdoc": "^39.3.6"
   },
   "engines": {
     "node": ">=14"