Merge branch 'arbitrary-command' into 'master'

Added the "arbitrary command" action and documented the available

See merge request argo/argotest!7
1 job for 1-base-features-stop-if-daemon-dies in 6 seconds (queued for 55 minutes and 23 seconds)
Status Job ID Name Coverage
  Test
passed #16146
integration
integration.test

00:00:06