Enabling clean PRs in Leyden

[Aleksey Shipilev]

Hi,

Here is a short list of things in progress to make PR workflows useful in Leyden:

1. Enable Skara bots to show GHA results:
  https://bugs.openjdk.org/browse/SKARA-2353

2. jcheck configuration for the repository:
  https://github.com/openjdk/leyden/pull/11

3. Code changes to make most (all?) builds clean:
  (this one is progress, I need to confirm all GHA jobs are green)
  https://github.com/openjdk/leyden/pull/10


-- 
Thanks,
-Aleksey



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