fix: remove DATABASE_URL from CI test step

Author: Defendi22

.github/workflows/ci.yml

@@ -25,8 +25,6 @@ jobs:
 
       - name: Run tests
         run: pytest -v
-        env:
-          DATABASE_URL: postgresql://postgres:postgres@localhost:5432/urlshortener
 
   build:
     runs-on: ubuntu-latest