Previously the default oidc issuer was to one of the kubernetes clusters
running in my basement. This patch changes the issuer to the production
ready issuer running in EKS.
This command is just a prototype of how to fetch the platform model so
we can make it available to CUE.
The idea is we take the data from the holos server and write it into a
CUE `_Platform` struct. This will probably involve converting the data
to CUE format and nesting it under the platform struct spec field.
And add a logout command that deletes the token cache.
The token package is intended for subcommands that need to make API
calls to the holos api server, getting a token should be a simple matter
of calling the token.Get() method, which takes minimal dependencies.
