Merge branch 'set-workflow-default-and-rules' into 'master'

Set 'workflow:rules', and 'default'

See merge request gitlab-org/gitlab-exporter!112
2 jobs for master in 58 seconds
Status Job ID Name Coverage
  Test
passed #7542991
gitlab-org
rspec

00:00:54

passed #7542992
gitlab-org
rubocop

00:00:58