fix: spack:config:source_cache:/var/cache/spack

This avoids writing to /opt/spack/var/spack/cache (which ends up in the container).

assigned to @wdconinc

enabled an automatic merge when the pipeline for 764b4da4 succeeds

aborted the automatic merge because target branch was updated

added 3 commits

• 764b4da4...145bd543 - 2 commits from branch master
• 090a97dc - fix: spack:config:source_cache:/var/cache/spack

Compare with previous version

merged