try `mimalloc/local_dynamic_tls` (#363)
* try mimalloc/local_dynamic_tls, fix #362
* test builds
* correct install on build test
* fix test builds
* fix build testing
* test builds, tweak paths
* move repo access into "run" step
* add test-builds-os, remove pytest-codespeed
* fix tests on windows, tweak build images
* bump cache, revert build container
* simplify arch tests, uprev test deps
