//		The name of checksum database to use and optionally its public key and
//		URL. See https://golang.org/ref/mod#authenticating.
//	GOTOOLCHAIN
//		Controls which Go toolchain is used. See https://go.dev/doc/toolchain.
//	GOTMPDIR
//		The directory where the go command will write
//		temporary source files, packages, and binaries.
//	GOVCS
//		Lists version control commands that may be used with matching servers.
//		See 'go help vcs'.