remove-keys-from-deb to remove CI lock contention

[lk86]

Delete keys instead of trying to use them in deb package. This can be removed to make a final build on master for 4.1 but at the moment the keys are getting in the way.

Thank you for contributing to Coda! Please see CONTRIBUTING.md if you haven't
yet. In that doc, there are more details around how to start our CI.

Explain your changes here.

Explain how you tested your changes here.

Checklist:

• Document code purpose, how to use it
  • Mention expected invariants, implicit constraints
• Tests were added for the new behavior
  • Document test purpose, significance of failures
  • Test names should reflect their purpose
• All tests pass (CI will check this if you didn't)
• Serialized types are in stable-versioned modules
• Does this close issues? List them:

Closes #6498

[mrmr1993]

This will require a key download on every fresh run of a docker image. Approving, but @lk86 you should consider whether we want to pull keys as part of the docker build before merging.