Github (SSH) via public WIFI, port 22 blocked

I'm currently on a public WIFI  spot and I'm unable to use SSH (they probably blocked that port). However, I need that connection to do a git push.

➜ ssh -T git@github .com
ssh: connect to host github .com port 22: Connection refused

Is it possible to bypass this restriction by setting up a SSH tunnel via port 80 and tell github push to use that connection? How to do that? I'm on OSX (lion). This must be a common problem?