Add option to disable encryption KSOPS_NOP

[philhug]

I am trying to set up ksops with argocd-diff-review, and don't need argocd-diff-review to be able to decrpt the passwords.

But it should be able to execute kustomize without an error.

A possible solutions would be to define an environment variable, that will then just generate the secrets in encrypted form.

Or did I miss an another obvious solution?

This might also be useful int the case you want to kustomize build locally without keys available.

[project0]

I was just about to ask the same, i would like to build the manifests for testing in the CI and dont care about the real secrets.