Summary:
Compresses artifacts with LZMA by default. `--no-compression` can be used
to skip the quite time-intensive task to just quickly check if the archives
still add up to a full distribution.
Reviewed By: jknoxville
Differential Revision: D21456052
fbshipit-source-id: dfa4686f3fe7ce342b62dab4b5203bc0aad37d9a