feat: install valgrind as spack package

Instead of installing valgrind as a system package in the base layer, this installs it in the spack layer. That ensures consistency between valgrind suppression lists and the software they apply to (e.g. python).

assigned to @wdconinc

enabled an automatic merge when the pipeline for 26230e47 succeeds

aborted the automatic merge because target branch was updated

added 2 commits

• 94764993 - 1 commit from branch master
• fffa83b6 - feat: install valgrind as spack package

Compare with previous version

enabled an automatic merge when the pipeline for fffa83b6 succeeds

canceled the automatic merge

merged