GitLab is used only for code review, issue tracking and project management. Canonical locations for source code are still https://gitweb.torproject.org/ https://git.torproject.org/ and git-rw.torproject.org.
Snowflake is now an npm published package that can install a global bin with npm i -g
npm i -g
It seems to be missing a #!/usr/bin/env node at the top of the script though