Automate uploading tarballs to TMRC

[radix]

Do this please.

[therve]

Do you know how to make the upload? Is it ssh, sftp, ftp?

[radix]

Actually, we only have to get the files to cube. There's a cronjob that runs to rsync the files from cube to the mirrors. So we can sftp them to cube.

[radix]

I should mention that TMRC isn't really important here; the important thing is to automate the uploading of the tarballs to *somewhere* publicly accessible. This is an important distinction because there are  other file services with easy-to-use APIs which we could use for file hosting.

[jml]

FWIW, automatically uploading the tarballs to cube right now involves uploading to cube:/srv/www-data/twisted/Releases/<Project>/<First two parts of version number>/*. The directories need to be created, and the permissions need to be set correctly.

New directories are 2775, and ought to be in the www-data group. New files are 664, and ought to be in the www-data group.

[jml]

We might also want to automate signing the tarballs / msis and uploading the signatures.