Add support to prefix the key with tmux support

[MichaelJosephKramer]

• Add the --tmux command line option
• Prefix the key in the authorized keys file with a command that
  immediately directs the pair to the tmux session when the option is added
• Remove tmux prefix and the key when the key is removed

This feature is based on the pairing setup here: http://www.zeespencer.com/articles/building-a-remote-pairing-setup/. I got tired of pasting the tmux prefix manually, so I added a command line option to add it for me.

Despite the spirt of pairing, I hackety-hacked this solo, so please let me know if you have any suggestions/improvements. Thanks!

[jasonkarns]

👍

Though perhaps the flag should be just --ssh-options and the environment variable GH_AUTH_SSH_OPTIONS, since this feature need not be limited to tmux commands. Indeed, half of the options don't have anything to do with tmux at all. (no-port-forwarding,no-X11-forwarding,no-agent-forwarding)

[chrishunt]

Awesome idea! Thank you much. I was working on moving v3.0.0 over to Thor, so I wasn't able to merge this in, but I added the --command option which should do the trick. Closing this out.

$ gh-auth add --users=chrishunt --command="tmux attach"
Adding 2 key(s) to '/Users/chris/.ssh/authorized_keys'

$ cat ~/.ssh/authorized_keys
command="tmux attach" ssh-rsa ... https://github.com/chrishunt