Convert `baseURL` to snake_case first #102

Job	Run time
sdist	9s
windows (windows-latest, x86, x86)	2m 11s
musllinux (ubuntu-22.04, x86)	2m 13s
macos (macos-latest, aarch64)	54s
windows (windows-latest, x64, x64)	2m 24s
musllinux (ubuntu-22.04, armv7)	1m 21s
linux (ubuntu-22.04, x86_64)	1m 41s
musllinux (ubuntu-22.04, x86_64)	1m 23s
musllinux (ubuntu-22.04, aarch64)	1m 37s
linux (ubuntu-22.04, x86)	2m 10s
macos (macos-15-intel, x86_64)	1m 4s
linux (ubuntu-22.04, ppc64le)	2m 5s
linux (ubuntu-22.04, armv7)	2m 5s
windows (windows-11-arm, aarch64, arm64)	2m 32s
linux (ubuntu-22.04, aarch64)	2m 14s
linux (ubuntu-22.04, s390x)	1m 54s
Release	0s
	27m 57s

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