Setup a container cleanup policy

[kamarmack]

Err:

⚠  functions: No cleanup policy detected for repositories in ***. This may result in a small monthly bill as container images accumulate over time. 

Error: Functions successfully deployed but could not set up cleanup policy in location ***. Pass the --force option to automatically set up a cleanup policy or run 'firebase functions:artifacts:setpolicy' to manually set up a cleanup policy.

Maybe helpful? https://stackoverflow.com/a/67351574