Ability to pass extra arguments to kustomize build.

[csidiro]

Currently the arguments that are passed during a chartify of a kustomization build are
build --enable-alpha-plugins --load-restrictor=LoadRestrictionsNone --enable-helm --helm-command=helm

For plugins like ksops https://github.com/viaduct-ai/kustomize-sops need to pass extra arg --enable-exec.

Is it possible to add an option for extra arguments?

[yxxhero]

@csidiro ok.