ci: add GitHub Actions workflow for building and testing Astro app

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

@@ -0,0 +1,42 @@
+name: Build and Test Astro App
+
+on:
+  pull_request:
+    types: [opened, synchronize]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [18.x, 20.x]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Set up Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: 'npm'
+
+      - name: Cache npm modules
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.npm
+            node_modules
+          key: ${{ runner.os }}-node-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-
+
+      - name: Install dependencies
+        run: npm install
+
+      - name: Build Astro application
+        run: npm run build
+
+      - name: Test Astro application
+        run: npm run test