[SAC] [OSGeo] #2533: Set up debian11 for grasswiki

[OSGeo]

#2533: Set up debian11 for grasswiki
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 Reporter:  robe            |       Owner:  sac@…
     Type:  task            |      Status:  new
 Priority:  normal          |   Milestone:  Sysadmin Contract 2021-II
Component:  Systems Admin   |  Resolution:
 Keywords:  Mediawiki, lxd  |
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Comment (by robe):

 One of the causes of blank pages is the pcre changes
 https://www.mediawiki.org/wiki/Manual:Common_errors_and_symptoms#All_pages_have_no_content,_but_when_editing_a_page_the_wiki_text_is_there.

 On osgeo6 we have php 7.0 and on new grass-wiki is running php 7.3, so I
 guess this means I have to upgrade before I can confirm things are
 working. As the version of mediawiki is 1.27.1 and latest stable is 1.37.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2533#comment:18>
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