Is it safe to give you my SSH Keys?
Yes, We only store andd ask for your team members public keys. Public keys alone can not provide someone with access to your servers and are perfectly safe to share. To make use of the key you'd need the matching private key to exist on the users computer.
In fact public keys are so safe to share that if you have a Github account you can usually find any keys that you have added to your account by going to https://github.com/
For more details on your public and private keys, check out some of these articles from around the web: