chore: add GitHub Actions workflow for PR testing

Author: cjeongmin

.github/workflows/test.yml

@@ -0,0 +1,35 @@
+name: PR Test
+
+on:
+  pull_request:
+    branches: [main]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          ref: ${{ github.head_ref }}
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18'
+          cache: 'pnpm'
+
+      - name: Install dependencies
+        run: pnpm install
+
+      - name: Create .env file
+        run: echo "${{ secrets.FRONT_END_ENV }}" > apps/client/.env
+
+      - name: Run tests
+        run: pnpm run test