feat: integrate automated test coverage reporting into CI

.github/workflows/backend-tests.yml

@@ -0,0 +1,35 @@
+name: Backend Tests and Coverage
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    # This tells GitHub to run all these commands inside the backend folder
+    defaults:
+      run:
+        working-directory: ./apps/backend
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.10" 
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install -r requirements.txt
+        pip install pytest httpx pytest-cov
+
+    - name: Run tests with coverage
+      run: |
+        python -m pytest tests/ --cov=app --cov-report=term-missing