add option to remove digest from generated manifests for artifacts

[Bonehead5338]

Fixes: #3220 #3269

Description

image tags with sha256 appended are incompatible with Red Hat Openshift (because of CRI-O)

User facing changes (remove if N/A)

Option in skaffold.yaml at artifact to disable digest

Follow-up Work (remove if N/A)

If there is any chance of this being merged I can work on docs and test cases

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[Bonehead5338]

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[Bonehead5338]

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[Bonehead5338]

@googlebot I signed it!

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[Bonehead5338]

@googlebot I signed it!

[codecov]

Codecov Report

Merging #5567 (b8782ab) into master (5bf0323) will increase coverage by 0.00%.
The diff coverage is 75.00%.

@@           Coverage Diff           @@
##           master    #5567   +/-   ##
=======================================
  Coverage   71.07%   71.07%           
=======================================
  Files         402      402           
  Lines       15055    15062    +7     
=======================================
+ Hits        10700    10705    +5     
- Misses       3563     3564    +1     
- Partials      792      793    +1     

Impacted Files	Coverage Δ
pkg/skaffold/build/cache/retrieve.go	64.28% <0.00%> (-1.34%)	⬇️
pkg/skaffold/schema/latest/config.go	58.82% <ø> (ø)
pkg/skaffold/build/scheduler.go	94.82% <100.00%> (+0.48%)	⬆️

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[Bonehead5338]

I managed to get the cluster I was struggling with upgraded to latest openshift 4.3 version where CRI-O works with the hashes.