runtime error

Exit code: 1. Reason: Traceback (most recent call last): File "/home/user/app/app.py", line 6, in <module> from auth import ( File "/home/user/app/auth.py", line 4, in <module> from models import User, SessionLocal File "/home/user/app/models.py", line 34, in <module> engine = create_engine(os.environ['DATABASE_URL']) File "/usr/local/lib/python3.10/os.py", line 680, in __getitem__ raise KeyError(key) from None KeyError: 'DATABASE_URL'

Container logs: