add migration and enable ci

.github/workflows/backend-ci.yml

@@ -0,0 +1,29 @@
+name: Backend CI
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  unit-test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: backend
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.11'
+
+      - name: Install deps
+        run: pip install -r dev-requirements.txt
+
+      - name: Run tests
+        run: |
+          pytest -q