~/.ssh/config
Host githubuser.git.github.com
HostName github.com
IdentityFile ~/.ssh/id_rsa_githubuser
$ git remote add origin git@githubuser.git.github.com:githubuser/lambda-with-typescript.git
~/.ssh/config
Host githubuser.git.github.com
HostName github.com
IdentityFile ~/.ssh/id_rsa_githubuser
$ git remote add origin git@githubuser.git.github.com:githubuser/lambda-with-typescript.git