[SAC] [OSGeo] #2728: Upgrade osgeo6 to buster

[OSGeo]

#2728: Upgrade osgeo6 to buster
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2022-II
Component:  Systems Admin  |   Keywords:
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 Right now osgeo6 is at debian stretch level.  Which is two stable versions
 behind.  I had meant to do this last year.

 My main concern is with the mailing system.  When I had upgraded trac to
 buster the mail stopped working (I mean the mail server was working as far
 as I could tell, but trac couldn't use it) and I hadn't investigated why,
 Instead I just put in a stop gap to channel email thru osgeo6.


 Given that osgeo6 is our primary mail server, special attention must be
 given to make sure it doesn't happen and that lists still works after, and
 other services that channel mail thru it (osgeo.org, repo.osgeo.org,
 limesurvey.osgeo.org, talks.osgeo.org, trac.osgeo.org).

 After this is done, we should upgrade to bullseye after, but want to wait
 a month or so after this upgrade before attempting a bullseye upgrade.

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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2728>
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