Allow to customize publish.Namer

[cardil]

Fixes #476

• Adds ability to pass custom publish.Namer
• Adds ability to override default path separator, allowing use with container registries that don't allow nested repositories (Quay, Docker Hub etc.)

[jonjohnsonjr]

Exposing this as an option seems fine, but I'm less excited about another flag for this... want to split this into 2 PRs so we can land the namer change?

[cardil]

Okay. That seems reasonable to me. I would only need the code change, as I'm embedding ko in my build tools, so I think I'll just drop the flag out in this PR.

[codecov-commenter]

Codecov Report

Merging #477 (bd14330) into main (6447264) will decrease coverage by 4.32%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #477      +/-   ##
==========================================
- Coverage   53.13%   48.81%   -4.33%     
==========================================
  Files          36       42       +6     
  Lines        1848     2188     +340     
==========================================
+ Hits          982     1068      +86     
- Misses        715      942     +227     
- Partials      151      178      +27     

Impacted Files	Coverage Δ
pkg/commands/options/publish.go	42.85% <100.00%> (ø)
pkg/publish/default.go	56.86% <0.00%> (-4.98%)	⬇️
pkg/commands/commands.go	72.72% <0.00%> (-2.28%)	⬇️
pkg/commands/deps.go	15.18% <0.00%> (-2.06%)	⬇️
pkg/build/gobuild.go	56.61% <0.00%> (-1.83%)	⬇️
pkg/commands/resolver.go	31.88% <0.00%> (-0.63%)	⬇️
pkg/commands/config.go	57.37% <0.00%> (-0.15%)	⬇️
pkg/build/limit.go	55.55% <0.00%> (ø)
pkg/build/strict.go	100.00% <0.00%> (ø)
pkg/commands/apply.go	51.35% <0.00%> (ø)
... and 14 more

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[jonjohnsonjr]

Thanks!