Should store GitHub host pubkey in container instead of insecurely fetching through the network

[bwbuchanan]

This container currently uses ssh-keyscan to fetch the host key for the WP Engine SSH server before attempting to connect.

This is insecure and defeats the entire purpose of having a host key to authenticate the server.

I suggest that instead you hardcode WP Engine's SSH host public key(s) into the container, so that SSH will fail if someone is performing a man-in-the-middle-attack against the connection.