=build Use zulu in nightly build to test jdk21.

[He-Pin]

There is no jdk21 temurin release for now, so I have to switch to zulu or oracle :(

[pjfanning]

lgtm - we can switch back to temurin later (when they have a jdk 21 release)

[He-Pin]

@pjfanning Is there any special vaue to chose temurin instead of zulu or oracle?

[mdedetrich]

@pjfanning Is there any special vaue to chose temurin instead of zulu or oracle?

Temurin is built from official OpenJDK sources, zulu/oracle are not

[mkurz]

fyi, we had the same problem in Play. So I created my own jvm index that contains the latest Java Temurin ea builds: https://github.com/mkurz/jvm-index/blob/adoptium_temurin_eaps/index.json
Hopefully setup-action merges my PR for for the --jvm-index at some point: coursier/setup-action#465
Meanwhile I forked the action to be able to make use of the flag: playframework/.github@631bb35 and playframework/.github@216eb92
We can now sucessfully test Temurin ea builds: https://github.com/playframework/playframework/pull/11925/files#diff-063ca77e012f959eba648db60e6868875fd1e70e5f5ac081193d848f8d61ef32R86

[He-Pin]

@mkurz Where to ask they for doing a 21 release?

[mkurz]

@He-Pin
First Adoptium needs to provide the Temurin 21 builds, this usually takes a couple of days:
adoptium/temurin#7
So we just have to wait here.
Then the coursier jvm-index needs to fetch that new release once it's published, so we need to adjust this line to include 21: https://github.com/coursier/jvm-index/blob/master/src/Temurin.scala#L5
Then someone needs to run that tool, like described in the README of https://github.com/coursier/jvm-index/ so the index.json in that repository gets updated.