Create CI

.github/workflows/main.yml

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+name: Build & Test
+
+# For every push and pull_request
+on: [push, pull_request]
+
+jobs:
+  backend:
+    # use Ubuntu 22.04
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      # Install Node 18
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+      - run: cd backend
+      - run: npm ci
+      - run: npm run build
+      - run: npm run test
+  frontend:
+    # use Ubuntu 22.04
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      # Install Node 18
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+      - run: cd frontend
+      - run: npm ci
+      - run: npm run build
+      - run: npm run test