Replace hardcoded ~/.conan2 home with $(conan config home) #103

Job	Run time
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 33s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 39s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	1m 27s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	1m 42s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 32s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 33s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 35s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 35s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	1m 55s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	1m 45s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	1m 40s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	1m 41s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	1m 44s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	1m 41s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	1m 47s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	1m 48s
merge	0s
	26m 37s

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