In order to access your Github you need to do it via ssh. So you need to add your ssh public key to github. After that you are able to access github via ssh i.e.:
git init [email protected]:yourname/yourrepo.git See also: Github: generating ssh keys, WikiHow
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without certificate checks:
GIT_SSL_NO_VERIFY=true git clone https://github.com/p/repo.git For me it is still not clear what are you asking for, because you know that installing ca-certificates will fix the problem.