Don't set image.base.name if base is specified by digest

[imjasonh]

Based on conversation in google/go-containerregistry#1098

[jonjohnsonjr]

Instead of doing this in two places, you could capture the resulting build.Result from this block (as a separate function): https://github.com/google/ko/blob/4ff83080866f8acd0aba662c628eb69b8f9b940d/pkg/build/gobuild.go#L866-L881

And then just mutate.Annotations it in one place.

This is possible because build.Result: https://github.com/google/ko/blob/a85cfeb2041e2635735bf35eca59ab82eed8ad14/pkg/build/build.go#L47-L53

Is compatible with mutate.Annotatable: https://github.com/google/go-containerregistry/blob/a65a0a616b77e0460c5b4b999d3afc346e2d21af/pkg/v1/mutate/mutate.go#L119-L121

And publishers will have to do the casting themselves downstream.

[imjasonh]

Man that's nice. Good call 👍

[codecov-commenter]

Codecov Report

Merging #408 (2fcb7f3) into main (4ff8308) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #408      +/-   ##
==========================================
+ Coverage   42.10%   42.13%   +0.03%     
==========================================
  Files          35       35              
  Lines        1805     1806       +1     
==========================================
+ Hits          760      761       +1     
  Misses        906      906              
  Partials      139      139              

Impacted Files	Coverage Δ
pkg/build/gobuild.go	56.57% <100.00%> (+0.09%)	⬆️

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