Correctly set db url

Author: RealOrangeOne

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
           MYSQL_PASSWORD: password
 
     env:
-      DATABASE_URL: ${{ matrix.python }}
+      DATABASE_URL: ${{ matrix.database_url }}
 
     steps:
     - uses: actions/checkout@v2