You must configure OpenSSH Authentication Agent service to automatically start (or vous pouvez start it manually every time when opening your PowerShell for the first time: Start-Service ssh-agent).
Après cela, vous devez ssh-add C:\path\to\your\ssh\key\id_rsa only once. Après cela, every time the ssh-agent is started, the key will be there. Vous pouvez check with ssh-add -l.
To have SSH agent to automatically start with Windows, vous pouvez run:
`Set-Service ssh-agent -StartupType Automatic
on a Administrator PowerShell prompt.