obtains the Zig compiler toolchain

$ mix zig.get [--version VERSION] [--from FROM] [--os OS] [--arch ARCH]

the zigler compiler will be downloaded to ZIG_ARCHIVE_PATH/VERSION

if unspecified, VERSION defaults to the major/minor version of zig.get

if FROM is specified, will use the FROM file instead of getting from the internet.

if unspecified, ZIG_ARCHIVE_PATH defaults to the user cache path given by :filename.basedir/3 with application name "zigler".

OS and ARCH will be detected from the current build system. It's not recommended to change these arguments.

environment variable options

• TAR_COMMAND: path to a tar executable that is equivalent to gnu tar. only useful for non-windows architectures.
• NO_VERIFY: disable signature verification of the downloaded file. Not recommended.
• ZIG_ARCHIVE_PATH: path to desired directory to achive the zig compiler toolchain.