fix config dir handling. allow for relative paths, back pathing etc (… #35

Job	Run time
Call CMake Build / build macOS-x64	26m 20s
Call CMake Build / build macOS-arm64	32m 21s
Call CMake Build / build windows-x64-mingw	45m 0s
Call CMake Build / build windows-arm64-vs2022	32m 50s
Call CMake Build / build linux-x64	13m 2s
Call CMake Build / build linux-arm	23m 18s
Call CMake Build / build linux-arm64	23m 52s
Exercise CMake Artifacts	40s
	3h 17m 23s

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