feat: add CI workflow for backend and frontend tests

.gitea/workflows/test.yml

@@ -0,0 +1,37 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - '**'
+
+jobs:
+  backend-tests:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./backend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: ./backend/package-lock.json
+      - run: npm ci
+      - run: npm test
+
+  frontend-tests:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./frontend
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: ./frontend/package-lock.json
+      - run: npm ci
+      - run: npm run test:run