macOS: Should swiftly support toolchains in /Library/Developer/Toolchains?

[iainsmith]

Some people prefer to install the toolchains to /Library/Developer/Toolchains for all users on the system to use. Do people think swiftly should support this use case through configuration / prompt / auto detecting / not for now?

Would people want to support this through a SWIFTLY_TOOLCHAINS env variable?

From swiftly init

/Users/iain/Library/Application Support/swiftly - Data and configuration files directory including toolchains
/Users/iain/Library/Application Support/swiftly/bin - Executables installation directory

Note that the locations can be changed with SWIFTLY_HOME and SWIFTLY_BIN environment variables and run
this again.