[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 Sandro Santilli <strk@…>):

 In [changeset:"e2bf40c322c8805ca13e5a270b98b2793ee436a3/git" e2bf40c/git]:
 {{{#!CommitTicketReference repository="git"
 revision="e2bf40c322c8805ca13e5a270b98b2793ee436a3"
 Set ownership of packaged functions to extension owner

 Still check that the functions were owned by a superuser.

 References #4648
 References #5545
 References #5566
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5566#comment:10>
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