use variable for clone

Author: gnunn1

content/modules/ROOT/pages/01-getting-started.adoc

@@ -255,5 +255,5 @@ To proceed with the workshop, you will need to clone the workshop git repository
 [.console-input]
 [source,bash,subs="attributes+,+macros"]
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-git clone -b main --single-branch https://github.com/OpenShiftDemos/advanced-gitops-workshop ~/workshop
+git clone -b {gitops_revision} --single-branch https://github.com/OpenShiftDemos/advanced-gitops-workshop ~/workshop
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