Thanks for follow-up and sharing additional info. The error : input required and not supplied: user name; suggests that the workflow is expecting a username for the Azure Container Registry login, but it hasn't been provided.
If you haven't done already so, please add and save secret on the Settings'. For the steps, kindly checkout this SO discussion thread which addresses a similar ask, for the steps (by Arko).
Enable and review logs to fetch more details about the error.
Ref: Python Deployments: ‘File not found’ and filesystem directory differences with app content
Kindly let us know, I'll follow-up with you further.