Builds a package (binary on OS X or Windows) and inserts it into an existing
drat repository via drat::insertPackage().
Also knits the index.Rmd file of the drat if it exists.
step_add_to_drat()Other steps: step_add_to_known_hosts,
step_build_pkgdown,
step_do_push_deploy,
step_hello_world,
step_install_pkg,
step_install_ssh_keys,
step_push_deploy,
step_run_code,
step_setup_push_deploy,
step_setup_ssh,
step_test_ssh,
step_write_text_file