[FEAT] Introduce an equivalent to the preview tag of the original container

[TheColin21]

Is this a new feature request?

• I have searched the existing issues

Wanted change

This is similar to #300 but a bit simpler.
I would love to see a tag between stable and nightly that tracks the preview branch which currently contains the 10.11 release candidates.
You could call it develop to match your naming scheme as I understood it.

Reason for change

10.11 has been in RC status for quite some time and seems reasonably stable to try out which would be much easier if I could just copy my config folder and spin up a second instance on 10.11.

Proposed code change

No response

[aptalca]

Iirc their preview releases are all one offs and thus not suitable for our ci. They don't get published in release channels like their stable and nightly/beta releases do.

[TheColin21]

That's a shame. Could you point me to where you 'source' the app versions?

[aptalca]

https://github.com/linuxserver/docker-jellyfin/blob/master/jenkins-vars.yml#L6

[TheColin21]

Yeah it's not there.
Although I think it might not be too much trouble to instead parse https://repo.jellyfin.org/?path=/server/ubuntu/latest-preview/amd64
(Or https://repo.jellyfin.org/?path=/server/ubuntu/latest-stable/amd64 for stable and https://repo.jellyfin.org/?path=/server/ubuntu/latest-unstable/amd64 for nightly).

Of course parsing HTML with grep would probably be a very bad idea but an XML parser could work🤔

[TheColin21]

It could work something like this with xmllint:

curl -s 'https://repo.jellyfin.org/?path=/server/ubuntu/latest-preview/amd64' \
  | xmllint --html --xpath '//a[starts-with(text(),"jellyfin-server_")]/text()' - 2>/dev/null \
  | sed -E 's/^jellyfin-server_([^_]+)_amd64\.deb$/\1/' \
  | sort -V \
  | tail -n1

[LinuxServer-CI]

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[LinuxServer-CI]

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