[PostGIS] #5566: Add CI testing under sandboxed system

[PostGIS]

#5566: Add CI testing under sandboxed system
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  Reporter:  strk          |      Owner:  robe
      Type:  task          |     Status:  new
  Priority:  medium        |  Milestone:  Website Management, Bots
 Component:  QA/buildbots  |    Version:
Resolution:                |   Keywords:  pgextwlist
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Comment (by strk):

 The ownership check was implemented in commit
 [06f49e8dc83cfd7319709518ba479a3fd95e5000/git]  referencing #4648
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5566#comment:8>
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