makepkginfo --nopkg
--installcheck_script installcheck_script.sh
--postinstall_script postinstall_script.sh
--uninstall_script uninstall_script.sh
--unattended_install
--unattended_uninstall
--uninstall_method uninstall_script
--name Enable_SSH
--pkgvers 1.0 > Enable_SSH-1.0.plist
Add <key>uninstallable</key><true/> to the plist and copy to the munki repo. Remember to makecatalogs or it didn't happen.