Merge pull request #48968 from kalexand-rh/4.12-preview

adding 4.12 distro for preview site

Author: kalexand-rh

_distro_map.yml

@@ -131,6 +131,9 @@ openshift-enterprise:
     enterprise-4.11:
       name: '4.11'
       dir: container-platform/4.11
+    enterprise-4.12:
+      name: '4.12'
+      dir: container-platform/4.12
 openshift-dedicated:
   name: OpenShift Dedicated
   author: OpenShift Documentation Project <[email protected]>