I'll see if this works on Github-actions before making it CI-only.
I think we do want it only on CI because it's noticeably slower than normal (but still *MUCH* faster than Valgrind!)

Lol, suprise surprise! Valgrind and the Sanitizer don't run well together! :)
MSVC isn't playing ball for some reason, it links but every test fails and I'm not seeing ASAN errors (unless those failures are caused by ASAN --need to troubleshoot this by forcing UB to see how ctest reports it...)

[skip ci]

Maybe the object libraries are compiled only with `tests-config` options rather than options set on the `tests` target itself...

…ssue

I think I might have to rewrite cmake-sanitizers to expose a usage-requirements interface library for sanitizers: https://cmake.org/cmake/help/latest/manual/cmake-buildsystem.7.html#interface-libraries:~:text=Another%20use%2Dcase%20is%20to%20employ%20an%20entirely%20target%2Dfocussed%20design%20for%20usage%20requirements%3A