Background is that you have multiple github.com or bitbucket.org accounts configured on your client
and want you want to deploy to a remote server using ssh AgentForwarding.

Issue is that ssh client will try all keys and use first which connects to remote host,
which may be wrong, personal instead of company, or vice versa.

Make sure your key is added to `ssh-agent`

```bash
ssh-add -l  | grep me@personal
# 2048 01:0f:f4:3b:ca:85:d6:17:a1:7d:f0:68:9d:f0:a2:db me@personal (RSA)
```

`~/.ssh/config` on client:
```
Host personal-app-deploy
  Hostname myapp.com
  ForwardAgent true
```

To force ssh client to use correct key from agent,
you add **public** key to the server.

You can get public key with `ssh-add -L  | grep me@personal`

`~/.ssh/bitbucket.pub` on server:
```
ssh-rsa AAAAB3NzaC... me@personal
```

Tell ssh client to use that key.
`~/.ssh/config` on server:
```
Host bitbucket.org
  Hostname bitbucket.org
  IdentityFile ~/.ssh/bitbucket.pub
  IdentitiesOnly yes
```