skaffold apply does not support --rpc-port (and similar flags atm)

[aaron-prindle]

Currently --enable-rpc is deprecated atm and skaffold apply does not support --rpc-port meaning there is no acceptable way atm to setup the skaffold-server/watch-events with skaffold apply. We should add apply to the list of commands which take the --rpc-port flag and similar flags (--rpc-http-port, etc.) and plumb them through so that when we eventually fully deprecate --enable-rpc there will not be any breaking workflows

[tejal29]

@OladapoAjala would you be interested in working on this?

[aaron-prindle]

Awesome! We can assign this issue to you then @OladapoAjala. Seems I am not able to assign this using the Github UI currently though, perhaps when your other PR is merged then you will be available to be assigned via the UI.

[OladapoAjala]

@aaron-prindle you can assign this now that I have commented on it.

[aaron-prindle]

Great, I've assigned this now. For more context here, currently skaffold apply supports the --enable-rpc flag which is deprecated but not the newer --rpc-port flag:
https://github.com/GoogleContainerTools/skaffold/blob/main/cmd/skaffold/app/cmd/flags.go#L210-L217
Name: "rpc-port",
...
DefinedOn: []string{"dev", "build", "run", "debug", "deploy", "test", "verify"}, // <--- no "apply" currently, needs to be added

I believe you will need to add apply to the DefinedOn values and possibly do additional plumbing but I think that might actually be it IIUC