[PostGIS] #6126: Document requirement for ci status update

[PostGIS]

#6126: Document requirement for ci status update
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  Reporter:  strk         |      Owner:  robe
      Type:  enhancement  |     Status:  closed
  Priority:  medium       |  Milestone:  Website Management, Bots
 Component:  website      |    Version:
Resolution:  invalid      |   Keywords:
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Changes (by strk):

 * resolution:   => invalid
 * status:  new => closed

Comment:

 Oh never mind, I see that README documents `make publish` which in turn
 ends up calling the `ci` target, so we can say it IS documented.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6126#comment:1>
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