Add support for specifying custom Dockerfile for building agent images

[angrybayblade]

Proposed changes

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Fixes

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Types of changes

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• Non-breaking fix (non-breaking change which fixes an issue)
• Breaking fix (breaking change which fixes an issue)
• Non-breaking feature (non-breaking change which adds functionality)
• Breaking feature (breaking change which adds functionality)
• Refactor (non-breaking change which changes implementation)
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Checklist

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• I have read the CONTRIBUTING doc
• I am making a pull request against the main branch (left side). Also you should start your branch off our main.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have locally run services that could be impacted and they do not present failures derived from my changes
• Public-facing documentation has been updated with the changes affected by this PR. Even if the provided contents are not in their final form, all significant information must be included.
• Any backwards-incompatible/breaking change has been clearly documented in the upgrading document.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ae2a0a9) 94.13% compared to head (eb0af7f) 94.13%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2091   +/-   ##
=======================================
  Coverage   94.13%   94.13%           
=======================================
  Files         255      255           
  Lines       15787    15789    +2     
=======================================
+ Hits        14861    14863    +2     
  Misses        926      926           

Flag	Coverage Δ
unittests	94.13% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
autonomy/cli/build_images.py	100.00% <100.00%> (ø)
autonomy/cli/helpers/image.py	100.00% <ø> (ø)
autonomy/deploy/image.py	100.00% <100.00%> (ø)

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[0xArdi]

cool feature