Create backend.yml

.github/workflows/backend.yml

@@ -0,0 +1,25 @@
+name: Github Actions BackEnd Test
+
+run-name: ${{ github.actor }} is learning GitHub Actions
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '20'
+
+      - name: Install dependencies
+        run: npm install
+        working-directory: ./backend
+
+      - name: Run build
+        run: npm run build
+        working-directory: ./backend