chore: enable platform flag in render command

[ericzzzzzzz]

Description

• a user can use --digest-source=local with render command followed by skaffold apply command to deploy his applications. In this flow, skaffold will build image to get digest first, by default the arch of built image by docker is the same as the host, if the host is connected to a cluster which doesn't have compatible nodes can run the image, say the host is an amd machine and it's connected to arm cluster, the deployment will fail.
• enable platform in render to allow user specify the target platform a build artifact is for.

[codecov]

Codecov Report

Merging #7885 (6f7e9af) into main (290280e) will decrease coverage by 3.80%.
The diff coverage is 53.94%.

@@            Coverage Diff             @@
##             main    #7885      +/-   ##
==========================================
- Coverage   70.48%   66.67%   -3.81%     
==========================================
  Files         515      593      +78     
  Lines       23150    28698    +5548     
==========================================
+ Hits        16317    19135    +2818     
- Misses       5776     8155    +2379     
- Partials     1057     1408     +351     

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/credits/export.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/deploy.go	40.90% <0.00%> (-12.94%)	⬇️
cmd/skaffold/app/cmd/test.go	44.44% <0.00%> (ø)
cmd/skaffold/skaffold.go	0.00% <0.00%> (ø)
cmd/skaffold/app/cmd/inspect_tests.go	62.50% <14.28%> (-1.14%)	⬇️
cmd/skaffold/app/cmd/render.go	35.48% <18.18%> (-5.90%)	⬇️
cmd/skaffold/app/cmd/lsp.go	28.12% <28.12%> (ø)
cmd/skaffold/app/cmd/run.go	64.28% <33.33%> (-9.63%)	⬇️
cmd/skaffold/app/cmd/fix.go	56.41% <37.50%> (-20.07%)	⬇️
cmd/skaffold/app/cmd/verify.go	41.17% <41.17%> (ø)
... and 365 more

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