Remove NONROOT_USER, better support for rootless environment #106

Job	Run time
build (linux/amd64, ubuntu-24.04, bookworm, clang, 18)	1m 47s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 12)	1m 36s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 14)	2m 14s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 16)	2m 10s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 16)	1m 43s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 13)	1m 37s
build (linux/amd64, ubuntu-24.04, bookworm, gcc, 14)	1m 38s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 18)	2m 4s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 20)	1m 39s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 17)	1m 41s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 17)	2m 16s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 19)	1m 49s
build (linux/amd64, ubuntu-24.04, bookworm, clang, 19)	1m 36s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 13)	1m 45s
build (linux/arm64, ubuntu-24.04-arm, bookworm, clang, 20)	1m 59s
build (linux/arm64, ubuntu-24.04-arm, bookworm, gcc, 12)	1m 50s
merge	0s
	29m 24s

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