title: How to use ssh identity file with Github Actions
body: <p>I'm in the throes of setting up a Github Action that should run an SSH command to connect to a private server. The private server's connection settings i have specify an identityFile, which I do own. After this connection, I will then run a proxycommand, so this is essentially to a bastion, for context.</p>
  
  <p>What I cannot quite figure out at this point is how/which github action supports this configuration. I see the commands on this one (similar to others): <a href="https://github.com/appleboy/ssh-action/blob/master/action.yml" rel="nofollow noreferrer">https://github.com/appleboy/ssh-action/blob/master/action.yml</a> and no mention of identifyFile property. Is there another way to execute this or a ssh command that can make this possible?</p>
  
  <p>Would appreciate some pointers, thanks!</p>