Use `shp` as a kubectl plugin with Krew

[adambkaplan]

Feature Request

Krew provides a management system for Kubernetes plugins.
Kubernetes plugins have a fairly simple API contract:

• Binary must be named kubectl-xxx, where xxx is the plugin name.
• Binary is placed in a specified path known to kubectl

This would allow the shp commands to be invoked indirectly with kubectl:

$ kubectl shp build run ...

There are a few advantages to creating a kubectl plugin:

• Shipwright's binary can inherit context/configuration from kubectl.
• Package managers like krew make it easier for developers to adopt Shipwright.

See the developer documentation for best practices on how we could distribute shp as a plugin.

/kind feature

[SaschaSchwarze0]

From grooming: nothing that we consider to be done soon.

[otaviof]

We should split this into tasks:

• Make sure we publish kubectl-shp for the same platforms supported;
• Create and submit a Krew Manifest;

[liangyuanpeng]

I'm interested in this,Can i work for it?

/cc @adambkaplan @SaschaSchwarze0 @otaviof

[otaviof]

I'm interested in this,Can i work for it?

Sure, please go head! 🙏 Let me know anything I may help.