fix: add database connection env var to unit tests

Author: Joao-Pedro-P-Holanda

.github/workflows/unit_test.yml

@@ -18,6 +18,7 @@ jobs:
           - "3.13"
     env:
       UV_PYTHON: ${{ matrix.python-version }}
+      SQLALCHEMY_DATABASE_URI: "sqlite:///test.db"
     steps:
     - uses: actions/checkout@v4