Simple Frontend Build Test

This patch adds a simple test for checking if the frontend builds
properly. This is similar to the recently added backend check and will
be run automatically on pushes and pull requests.

.github/workflows/frontend-test.yml

@@ -0,0 +1,29 @@
+name: Test ₣ontend
+
+on:
+  pull_request:
+    paths:
+      - "frontend/**"
+      - ".github/workflows/frontend-test.yml"
+  push:
+    paths:
+      - "frontend/**"
+      - ".github/workflows/frontend-test.yml"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+
+      - name: install dependencies
+        working-directory: frontend
+        run: npm i
+
+      - name: build frontend
+        working-directory: frontend
+        run: npm run build