Only patch Yum mirrors for CentOS Docker builds.  Fixes #20617.
Only patch Yum mirrors for CentOS Docker builds.  Fixes #20617.

lindsayad/moose,andrsd/moose,andrsd/moose,jessecarterMOOSE/moose,dschwen/moose,milljm/moose,jessecarterMOOSE/moose,laagesen/moose,andrsd/moose,idaholab/moose,idaholab/moose,bwspenc/moose,harterj/moose,harterj/moose,laagesen/moose,lindsayad/moose,harterj/moose,andrsd/moose,laagesen/moose,bwspenc/moose,sapitts/moose,sapitts/moose,sapitts/moose,idaholab/moose,idaholab/moose,lindsayad/moose,milljm/moose,milljm/moose,lindsayad/moose,bwspenc/moose,dschwen/moose,andrsd/moose,harterj/moose,idaholab/moose,dschwen/moose,milljm/moose,jessecarterMOOSE/moose,sapitts/moose,milljm/moose,bwspenc/moose,harterj/moose,laagesen/moose,sapitts/moose,jessecarterMOOSE/moose,bwspenc/moose,dschwen/moose,laagesen/moose,dschwen/moose,lindsayad/moose,jessecarterMOOSE/moose