RFR: 8342988: GHA: Build JTReg in single step

[Aleksey Shipilev]

On Fri, 25 Oct 2024 15:16:30 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> > Can we trust the cache that much? I mean, up to now it's only been a performance hack, now it will become a necessary part of the pipeline.
> 
> Yeah, I guess that's the risk. I can redo this to use the same upload/download-artifact we use to transfer bundles between build and test jobs. Probably next week.

Actually, as I read ["Caching dependencies to speed up workflows"](https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/caching-dependencies-to-speed-up-workflows), this is not as high of the risk: "GitHub will remove any cache entries that have not been accessed in over 7 days. There is no limit on the number of caches you can store, but the total size of all caches in a repository is limited to 10 GB. Once a repository has reached its maximum cache storage, the cache eviction policy will create space by deleting the oldest caches in the repository."

I don't think we are anywhere close to 10GB limit for a single PR. I guess we can have some thrashing when there are multiple PRs in flight. Using artifacts would likely be more bullet-proof.

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PR Comment: https://git.openjdk.org/jdk/pull/21692#issuecomment-2438177353