Generates an RSA SSH host key for local Termite.SSH development.
mix termite.ssh.gen_host_keyThe private and public keys are written to priv/ssh. Existing keys are
preserved unless --force is supplied:
mix termite.ssh.gen_host_key --forceThe private key is created with owner-only (0600) permissions. Production
deployments should provision and protect host keys independently of the
application release.