[minxomat]

I sometimes use GitHub for this. A developer's most up to date keychain is probably their GitHub account, so granting them access is as simple as

    curl -Ls github.com/turbo.keys >> ~/.ssh/authorized_keys

Simplified of course. A script is usually used to revoke that access shortly after. Plus 2FA SSH.

[rmetzler]

Gitlab also has a keys URL, but I can’t say if it’s available for unauthorized clients from the top of my head (currently on mobile). For me it’s usually the fastest way to authorize other team members.

[yellowapple]

I had no idea about github.com/$USER.keys. That's handy as hell.

[NikolaeVarius]

Huh, never occurred to me to do it this way.