How to use ssh authentication for git on Windows 10

instructions

1. Add ssh key to shh config:

    Host github.com
      IdentityFile C:\Users\XXX\.ssh\github_id_rsa
      
2. Auto-start OpenSSH Authentication Agent (via PowerShell as admin)

    Set-Service ssh-agent -StartupType Automatic
     
3. Make git use Window's OpenSSH installation and not its own:

    setx GIT_SSH "C:\Windows\System32\OpenSSH\ssh.exe"