[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:  buildbots  |    Version:
Resolution:             |   Keywords:  pgextwlist
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Comment (by strk):

 The original problem description is in #5442 which reports 2 problems:
   1. Changing boot value based on current value rather than bool value
   2. Changing session value based on boot val rather than current val

 Jeff is my understanding of the problem correct ?

 Regina: would there be any problem to set per-function search_path rather
 than fully qualified all those pg_catalog calls ? That hurts my eyes :)
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5566#comment:4>
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