Added redhat stable step.
Added redhat stable step.

es/agent,Shopify/agent,grosskur/agent,grosskur/agent,Shopify/agent,Jasperswaagman/agent,es/agent,es/agent,buildkite/agent,Shopify/agent,Jasperswaagman/agent,Jasperswaagman/agent,buildkite/agent,grosskur/agent,buildkite/agent