Add CI jobs for cppcheck
The following discussion from !7732 (merged) should be addressed:
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@seanm started a discussion: (+2 comments)
cppcheck finds a lot of things clang-tidy doesn't. I have a cppcheck build submitting to cdash, but it's been borked for a while, I have to fix that... I run cppcheck by hand every time there's a new version out though.