Add PR test workflow

.github/workflows/pr-tests.yml

@@ -0,0 +1,76 @@
+name: PR Tests
+
+on:
+  pull_request:
+    types:
+      - opened
+      - synchronize
+      - reopened
+      - ready_for_review
+  workflow_dispatch:
+
+concurrency:
+  group: pr-tests-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  web-tests:
+    name: Web Build And Test
+    if: ${{ github.event_name != 'pull_request' || !github.event.pull_request.draft }}
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: web
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up pnpm
+        uses: pnpm/action-setup@v4
+        with:
+          version: 9
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: pnpm
+          cache-dependency-path: web/pnpm-lock.yaml
+
+      - name: Install dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Build frontend
+        run: pnpm build
+
+      - name: Run frontend unit tests
+        run: pnpm test
+
+  server-tests:
+    name: Server Unit Tests
+    if: ${{ github.event_name != 'pull_request' || !github.event.pull_request.draft }}
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: server
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+          cache: maven
+
+      - name: Ensure Maven wrapper is executable
+        run: chmod +x mvnw
+
+      - name: Run backend unit tests
+        run: ./mvnw test