Reworked the `deploy:check_remote` step, to use the `on(localhost(), ...)`,
instead of relying on `runLocally`.
This has been changed, to make sure that the all functions that
are being executed and are related to "local" part of the logic,
are ran on the local host.
Previously in `runLocally(sprintf("%s ls-remote $opt $repository $ref", get('bin/git')));`
the `get('bin/git')` would've been executed on the remote host, which
could have resulted in an unexpected behaviour.
By closing all of the instructions, in the closure that is executed
by the `on()` function, we are sure that the context is set to the
right host.
