[SAC] [OSGeo] #2243: Upgrade to nextcloud latest

[OSGeo]

#2243: Upgrade to nextcloud latest
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 Reporter:  robe           |       Owner:  sac@…
     Type:  task           |      Status:  new
 Priority:  normal         |   Milestone:  Sysadmin Contract 2020-I
Component:  Systems Admin  |  Resolution:
 Keywords:  nextcloud      |
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Comment (by robe):

 okay looks like we need to do 3 upgrades to go to 18 as hopping from 15 ->
 18 is not supported.

 I'm testing now with backup copy of the nextcloud container on osgeo4 to
 make sure no surprises.  I'll also move the data folder in the process as
 it will make future upgrades easier too.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2243#comment:7>
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