My question was more the git command in the article I was curious about, I have never used that command myself and I was not sure if there was a weird limitation (possibly related to the git context) that it only worked with files within the git repo.
I am just trying to figure out how we are jumping from storing in ~/.ssh to storing in the repo here.
(I believe replacing "/home/your_user" with "~" works too)
I use this all the time as my main key is ed25519 but some old repositories only support rsa keys.
The sshCommand config is, as the name says, the literal ssh command that is used by git when operations that call a remote with ssh (usually push/pull). You can also put other ssh options in there if you need.
Another option to achieve the same effect is to setup directly in your ~/.ssh/config:
Host your_custom_alias
HostName git.domain.com
User git
IdentityFile ~/.ssh/your_custom_key
then instead of "git clone git@git.domain.com:repo.git" you clone it with "git clone your_custom_alias:repo.git" (or you change the remote if is already cloned). In this case you don't need to have to change the git sshCommand option.
I am just trying to figure out how we are jumping from storing in ~/.ssh to storing in the repo here.