allow specifying version with --controller-version or --dependency-file

[jrryjcksn]

Since wksctl can be used without a dependency file, maintain the --controller-version option while adding the --dependency-file option. The dependency file will take precedence.

[kingdonb]

I am using firekube and just bumped my wksctl to alpha4, which fails at:

log "Updating container images and git parameters"
wksctl init --git-url="$(git_ssh_url "$(git_remote_fetchurl "${git_remote}")")" --git-branch="$(git_current_branch)"

from setup.sh, with this error:

• Updating container images and git parameters
open ./dependencies.toml: no such file or directory

It looks like this is meant to be an optional argument, to phase in dependencies.toml. I was able to bypass it by touching an empty dependencies.toml, I'm not sure if that's intentional or if I should need to do that.

Maybe you have already planned to update firekube with a dependencies.toml before the next wksctl release, I just noticed it's been a bit since this was merged, and it doesn't look like there is any documentation / example or note about what kind of dependencies that file is for exactly.