Build image from Fedora base

[saw-jan]

Since there is an issue with running ubuntu22 based image in drone-ci (see #34), with this PR, the image can be built on Fedora base which works in drone-ci.

Remaining tasks:

• fix icons not visible
• pipeline for build this image (or remove ubuntu one)
• test in GUI tests pipeline (tests can run: https://drone.owncloud.com/owncloud/client/12948)

[saw-jan]

This is also ready for review. And also have to discuss on whether to keep or remove ubuntu image.

CC @individual-it @TheOneRing @fmoc

[fmoc]

Seems reasonable to me. The Dockerfile and configs look good.

Please note that Fedora is a short-lived distribution and they tend to break things with every release. I'd recommend you to slowly transition back to Ubuntu LTS later on.

[saw-jan]

Seems reasonable to me. The Dockerfile and configs look good.

Please note that Fedora is a short-lived distribution and they tend to break things with every release. I'd recommend you to slowly transition back to Ubuntu LTS later on.

So, we need to have both (Ubuntu and Fedora) as for now? And then slowly discard Fedora if using Ubuntu22.04LTS works.

[saw-jan]

Possible tags with this PR:
fedora: fedora, fedora-6.7-20220106-1008-qt515x-linux64, fedora-36-6.7-20220106-1008-qt515x-linux64
latest: latest, 6.7-20220106-1008-qt515x-linux64, u22.04-6.7-20220106-1008-qt515x-linux64
qt512: qt512, qt512-6.7-20210421-1504-qt512x-linux64

CC @individual-it @fmoc

[individual-it]

let's change the tagging to be more consistent and then I think we can merge this
fedora: fedora, fedora-6.7-20220106-1008-qt515x-linux64, fedora-36-6.7-20220106-1008-qt515x-linux64
latest: latest, ubuntu-6.7-20220106-1008-qt515x-linux64, ubuntu-22.04-6.7-20220106-1008-qt515x-linux64
qt512: qt512, qt512-6.7-20210421-1504-qt512x-linux64

[fmoc]

So, we need to have both (Ubuntu and Fedora) as for now? And then slowly discard Fedora if using Ubuntu22.04LTS works.

What I was trying to say is, let's use Fedora 36 if it works now so that the tests are running again. Then, we have time until Fedora 36 becomes EOL to transition back to, e.g., Ubuntu.