1. excuter ssh-keygen -t dsa create ssh public key in siteground by ssh
2 copier .ssh/is_dsa.pub public key à bitbucket
3. ssh -T git@bitbucket.org tester login bitbucket
4.excuter git commande
https://confluence.atlassian.com/display/BITBUCKET/Set+up+SSH+for+Git
https://www.siteground.com/tutorials/siteground-git/github-siteground.htm