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We are currently running an older version of redmine which is still based on apk based installation.

The idea is to upgrade redmine by:

1. Install in new container (test already available)
2. Upgrade the current test install
3. check if current ruby deps are in aports (hint imagemagick)
4. install services currently running on redmine container
   1. smtp server (postfix)
   2. mqtt-exec to update local git repos for redmine
5. change dhcp server to use dhcp static ip assignment for new redmine.
6. update nginx proxy (and check config) to use new redmine
7. all that is forgotten

(from redmine: issue id 8446, created on 2018-01-29, closed on 2018-03-13)