Package Kubenix script (#62)

* Package Kubenix script

* Update changelog

* Fix hardcoded kubeconfig

* Expose generated manifest with Kubenix CLI derivation passthru

pkgs(kubenix): overhaul and drop support for the helm CLI (#24)

This is a relatively large re-design which

 - removes usage of the Helm CLI
 - expects users to override the default package
 - performs an interactive diff, confirm, apply by default
 - prunes removed resources

add release process and cut version 0.1.0 (#29)

Adding CI steps to tag releases following CHANGELOG entries to reduce
unknowns and provide an easy way to communicate relevant changes.