`make ssh-config` will generate a file ~/.ssh/config.d/infra-numbus with all
hostnames from the Ansible inventory. You can `Include` this file from your
main config file and re-generate it at will at any time. Having such a config
file makes it easier to ssh into any host on the fleet by taking advantage of
the built-in ssh hostname autocompletion in your shell.
The names of the entries were chosen in a way such that typing
ssh nimbus<tab>goerli<tab>
... produces the expected result.