ci: set GitHub Actions for testing

.github/workflows/test_pipeline.yml

@@ -0,0 +1,37 @@
+name: Pipeline
+on: [push, pull_request]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    env:
+      DATABASE_URL: ${{ secrets.DATABASE_URL }}
+
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_DB: test_db
+          POSTGRES_PASSWORD: test_pw
+          POSTGRES_USER: test
+        ports:
+          - 5432:5432
+
+    steps:
+      - name: Checkout repo files
+        uses: actions/checkout@v4
+
+      - name: Install Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12.1'
+
+      - name: Install Python package build/install dependencies
+        run: pip install --upgrade pip build setuptools
+
+      - name: Install test packages
+        run: pip install -e '.[test]'
+
+      - name: Run tests
+        run: pytest --cov=src . -vv