install beaker-docker in system_tests group
install beaker-docker in system_tests group

This was tested in https://github.com/voxpupuli/puppet-zabbix/pull/523/commits/8cb583e8b3a5228f74166a74efcf4b0c9434e6e6

dhoppe/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,puppet-community/modulesync_config,dhoppe/modulesync_config,dhoppe/modulesync_config,voxpupuli/modulesync_config,dhoppe/modulesync_config