Pass tag options by value

[dgageot]

Simplifies the code and prepares the work on tagging

Signed-off-by: David Gageot david@gageot.net

[codecov-io]

Codecov Report

Merging #1372 into master will decrease coverage by 0.02%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master    #1372      +/-   ##
==========================================
- Coverage   44.91%   44.88%   -0.03%     
==========================================
  Files         114      114              
  Lines        4925     4919       -6     
==========================================
- Hits         2212     2208       -4     
+ Misses       2486     2485       -1     
+ Partials      227      226       -1

Impacted Files	Coverage Δ
pkg/skaffold/build/gcb/cloud_build.go	0% <0%> (ø)	⬆️
pkg/skaffold/build/kaniko/kaniko.go	0% <0%> (ø)	⬆️
pkg/skaffold/build/tag/custom.go	37.5% <100%> (+7.5%)	⬆️
pkg/skaffold/build/local/local.go	51.78% <100%> (ø)	⬆️
pkg/skaffold/build/tag/git_commit.go	84.37% <100%> (ø)	⬆️
pkg/skaffold/build/tag/date_time.go	47.36% <100%> (-5.02%)	⬇️
pkg/skaffold/build/tag/env_template.go	88% <100%> (ø)	⬆️
pkg/skaffold/build/tag/sha256.go	66.66% <100%> (-6.07%)	⬇️

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[balopat]

LGTM