[ON HOLD] Update mechanism - allow the server to upgrade itself

[davidzwa]

Feature Description

It would be great and much more user-friendly if FDM Monster had a mechanism to install a new server release, update any dependency, and restart the server itself. Currently, the following installations need to be supported for update:

• docker --> documentation (Watchtower / Portainer / etc.)
• MonsterPi

Acceptance criteria

These are the tasks in order to deliver this feature:

• [ ] Add an update feature on the server
  • [ ] Which can be validated before updating (f.e. doing a git dirty check or a potential breaking change)
  • [ ] Which can update the server code base
  • [ ] Which can install dependencies
  • [ ] Execute a reboot
• [ ] Design an update page which can trigger and overview an update:
  • [ ] Show update progress
  • [ ] Present problem description and/or potential resolutions when updating does not pass validation. Also, when it fails before/during execution
  • [ ] Wait for the server to come alive when restarting
  • [ ] Reload the UI page when the server has been restarted

[mkevenaar]

ON HOLD until after a new MonsterPi release: v0.4.0