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On github you can use a deploy key at a time for user associating github.com to a private key configured in .ssh/config file.
Create a new user on system (e.g. userperrepo) Generate a public / private pair following github howto (e.g. /home/userperrepo/.ssh/id_ecdsa_github) Associate the key with the repo on github Add or change config file on the system to associate git@github.com with this private key
For example create a file named /home/userperrepo/.ssh/id_ecdsa_github with this content:
Host github.com Hostname github.com User git IdentityFile /home/userperrepo/.ssh/id_ecdsa_github
Since for a github constraint a single deploy key cannot be used more than one time, you have to create a different user per repo to use git pull / push on private repo via ssh without any other configuration or command.
For any user created for deploy, specify git essentials:
git config --global user.name "yourgithubname" git config --global user.email "youremail@example.com"
In theory, you can chain multiple Host github.com sections with different keys and the first working will be used. Practically, this is slow and error-prone so it’s better to use a different user per repo or try a different method.
Then you can pull and push from a private repo with a deploy key without any other commands.
If you want a single user to use multiple keys, you can follow this howto. But keep in mind that you can use this method using a docker container or a similar technology for a smoother deploy.
https://web.archive.org/web/20210110000000*/https://www.ssh.com/ssh/keygen/