feat: build and test frontend on PRs

On every PR against dev, main and release we want to run the following
checks:

* build the frontend w/o errors
* run unit tests
* run linter

Author: pheuberger

.github/workflows/build-and-test.yml

@@ -0,0 +1,34 @@
+name: Build and Test Frontend
+on:
+  pull_request:
+    branches: [ dev, main, release ]
+  push:
+    branches: [ dev, main, release ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: '9.2.0'
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Run tests
+        run: pnpm test
+
+      - name: Build frontend
+        run: pnpm build
+
+      - name: Run lint
+        run: pnpm lint