adopt XDG spec

[qrkourier]

This would provide the application with well-known, absolute, OS-appropriate, base directories for configuration and cache, if applicable. This computed base directory would redefine zrokDir, currectly {home}/.zrok.

A Go implementation: https://github.com/adrg/xdg

[michaelquigley]

This looks like a simple enough change. Might hold off until after the v0.4.0 release... save it for a point release. Need to consider how we'll want to migrate existing environments from the old location to the new.

[michaelquigley]

We're going to need to refactor this given the new environment package (replacing the old zrokdir). We're going to want to version the environment again, and the migration this time should move all of the old root contents to the new root.

Will also need to deal with environment backups as part of migration, and also chained migrations across multiple versions.

[qrkourier]

Does the new environment package have a notion like "profile" or "context?" I'm unsure how relevant it might be for most users to switch between zrok environments. I do it a lot as a tester, of course, so I like to wrap the binary with a --profile option.

[michaelquigley]

This is a card describing the feature to be built. zrok 1.0 will support multiple environments natively.