Do not use absolute urls in SCSS

[juliusknorr]

Absolute urls will not work with multiple trusted domains, since they are cached here.

Fix for #5085

[mention-bot]

@juliushaertl, thanks for your PR! By analyzing the history of the files in this pull request, we identified @LukasReschke, @schiessle and @nickvergessen to be potential reviewers.

[nickvergessen]

We can also have one cache per domain...
Why did we use absolute urls in firstplace? There has to be a reason

[juliusknorr]

We can also have one cache per domain...

That would be pretty bad, since then we would need to store an individual cached css file for each domain as well.

Why did we use absolute urls in firstplace? There has to be a reason

Not sure about that, I remember some issues with Nextcloud not running in root but I've tested that with the proposed changes and it works as well.

[nickvergessen]

Hmm is it possible that the problem is when two urls use a different subpath (folder)?

[juliusknorr]

@nickvergessen Is that something that is possible to configure?

So to summarize we can have one Nextcloud instance that can be accessed by the following set of URLs:
https://domain1.example.com/
https://domain2.example.com/
https://domain3.example.com/nextcloud/

Is there anything missing?

So i guess we should cache scss files then for each of this combinations of server host and subdirectories.

[MorrisJobke]

Tested and still works 👍