Pass correct build args to CreateDockerTarContext

[gsquared94]

Modified function parameters for CreateDockerTarContext so that we can pass in the updated build args.

[codecov]

Codecov Report

Merging #4768 into master will increase coverage by 0.04%.
The diff coverage is 94.11%.

@@            Coverage Diff             @@
##           master    #4768      +/-   ##
==========================================
+ Coverage   73.79%   73.83%   +0.04%     
==========================================
  Files         345      347       +2     
  Lines       13744    13755      +11     
==========================================
+ Hits        10142    10156      +14     
+ Misses       2970     2967       -3     
  Partials      632      632              

Impacted Files	Coverage Δ
pkg/skaffold/build/cluster/kaniko.go	0.00% <0.00%> (ø)
pkg/skaffold/schema/latest/config.go	100.00% <ø> (ø)
pkg/skaffold/schema/v2beta6/upgrade.go	100.00% <ø> (ø)
pkg/skaffold/schema/versions.go	82.75% <ø> (ø)
pkg/skaffold/diagnose/diagnose.go	58.33% <100.00%> (ø)
pkg/skaffold/docker/context.go	80.00% <100.00%> (ø)
pkg/skaffold/docker/image.go	73.36% <100.00%> (ø)
pkg/skaffold/schema/v2beta7/config.go	100.00% <100.00%> (ø)
pkg/skaffold/schema/v2beta7/upgrade.go	100.00% <100.00%> (ø)
... and 2 more

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