Otherwise, pip complains "cannot find a version satisfies the
requirement." I suspect it was due to caching issues. I usued to
manually add a `sleep 30` between the upload and the installation test
which is quite unstable.

`umask 0022` makes sure the created package will be accessible by all users.

`umask 0022` makes sure the created package will be accessible by all users.

The old one is deprecated and no longer working.