* upgrade stack snapshot to use ghc-9.2.5
* use lts-20.2
* Update alpine GHC Dockerfile to 9.2.5
We also build the Juvix runtime before the stack build in the
linux-static-binary workflow file.
* Add some documentation on how to build and deploy the alpine GHC image
* Docker documentation clarification.
Co-authored-by: Paul Cadman <git@paulcadman.dev>
