from https://github.com/spack/spack/commit/b0afb619dea4d593335d0b6db3facbf789b80bba

from https://github.com/spack/spack/commit/a2981cff1f69172089345d21dcf3122bef19ab6a

when deactivating the view, it is deleted, which is problematic in
production deployments

After each lab build job, generate a script that loads any jupyter extensions in the current env. The script will be used on Lab startup.

to avoid fs errors

to correctly set jupyter extension env vars

to be compatible with the Lab's base image