Clarify usage of ArtifactOverrides, ImageStrategy

[TBBle]

Related: #500, specifically addressing this comment

Description
ArtifactOverrides was incorrectly claiming it needed "values file" syntax, i.e. structured YAML, but it actually takes --set-string syntax, i.e. dotted path.

Also tied ArtifactOverrides directly to ImageStrategy, since the two work together.

Follow-up Work

I didn't check that ImageStrategy is meaningfully documented, so it might need a closer look too.

[codecov]

Codecov Report

Merging #4487 into master will increase coverage by 1.84%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4487      +/-   ##
==========================================
+ Coverage   72.39%   74.24%   +1.84%     
==========================================
  Files         334      338       +4     
  Lines       12992    14682    +1690     
==========================================
+ Hits         9406    10901    +1495     
- Misses       2987     3136     +149     
- Partials      599      645      +46     

Impacted Files	Coverage Δ
pkg/skaffold/schema/latest/config.go	100.00% <ø> (ø)
cmd/skaffold/app/cmd/render.go	36.36% <0.00%> (-6.50%)	⬇️
pkg/skaffold/test/test.go	95.40% <0.00%> (-4.60%)	⬇️
cmd/skaffold/app/cmd/deploy.go	62.50% <0.00%> (-4.17%)	⬇️
pkg/skaffold/yamltags/tags.go	96.46% <0.00%> (-3.54%)	⬇️
pkg/skaffold/deploy/kubectl/cli.go	88.39% <0.00%> (-2.52%)	⬇️
cmd/skaffold/app/cmd/run.go	52.38% <0.00%> (-0.57%)	⬇️
pkg/diag/validator/pod.go	2.39% <0.00%> (-0.42%)	⬇️
cmd/skaffold/app/signals.go	100.00% <0.00%> (ø)
pkg/skaffold/build/build.go	0.00% <0.00%> (ø)
... and 50 more

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[gsquared94]

Thanks for your contribution @TBBle. However this same change has already been checked in via a different PR so I'll close this one.

[TBBle]

@gsquared94 Can you tell which PR these changes are now in? I don't see them in the master branch, i.e. the ArtifactOverrides and ImageStrategy docs do not have my changes.

[gsquared94]

My bad, #4503 fixed the mistake in documentation for ArtifactOverrides only.

[TBBle]

Ah yes. I'd already rebased on #4503.

[TBBle]

Oops, and in the meantime, v2beta6 was released, so to pass CI I need to create a v2beta7. It seems a shame that I need to do that just for documentation updates.

So I'll sit on this for now, and once there's an actual v2beta7 config schema, rebase onto that.

[MarlonGamez]

hey! Just wanted to follow up and let you know that there's a v2beta7 now :)

[tejal29]

This change is a doc only change for the schema.
Its ok to merge this PR in.