ci: avoid creating files from inside docker container as root

[rrsettgast]

This PR does a few things now:

• We are having some issues where the docker container will create some files as root. If the job fails and the ci_build_and_test_inside_container.sh script doesn't finish, the runner is no longer usable until someone with root privileges deletes the files. This PR tries to avoid writing files as root.
• update silo in the spack config. updates hostconfigs for LC
• move rocky cuda build to streak2
• fix rtd builds resolves ReadTheDocs failure related to schema.xsd #3539

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.73%. Comparing base (983f60d) to head (7e4cc19).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3542      +/-   ##
===========================================
- Coverage    56.73%   56.73%   -0.01%     
===========================================
  Files         1165     1165              
  Lines       101488   101488              
===========================================
- Hits         57584    57582       -2     
- Misses       43904    43906       +2     

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