Currently the lint task uses Ubuntu Bionic, to be able to pin the python version to 3.6. However, this is problematic:

• While unlikely to happen soon, with the "Ubuntu Pro" stuff, it is unclear when Bionic is going to shut down
• This requires workarounds like

  bitcoin/ci/lint/04_install.sh

  Line 12 in 0968c51

  # Temporary workaround for https://github.com/bitcoin/bitcoin/pull/26130#issuecomment-1260499544

This should be fixed by switching to pyenv to pin the version, then bumping to Jammy to remove the git workaround.

I am not familiar with pyenv, which is why I created this issue, but apparently it is possible, see for example https://github.com/fanquake/core-review/blob/abf055db20c388e56185404ac03c7304f3905e39/docker/lint.dockerfile#L35

Edit: As a warning, the lint entry point is undocumented and may be unsafe, so run everything in a VM to be safe. Entry point:

Useful skills:

• Bash, Python, Pyenv, Ubuntu apt

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