RFR: 8342988: GHA: Build JTReg in single step

[Magnus Ihse Bursie]

On Thu, 24 Oct 2024 18:58:41 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> It is visible in current GHA runs that building jtreg sometimes break on dependencies checkout, for example:
> 
> 
> [build.sh][INFO] CYGWIN_OR_MSYS=0
> [build.sh][INFO] JAVA_HOME: /usr/lib/jvm/temurin-17-jdk-amd64
> [build.sh][INFO] Downloading https://archive.apache.org/dist/ant/binaries/apache-ant-1.10.8-bin.zip to /home/runner/work/jdk/jdk/jtreg/src/make/../build/deps/apache-ant-1.10.8-bin.zip
> Error: sh][ERROR] wget exited with exit code 4
> Error: Process completed with exit code 1.
> 
> 
> I suppose this is a side-effect of pulling lots of dependencies all at once. Building jtreg on every platform exposes us to these issues more often. Additionally, we had problems with building jtreg on various platforms. 
> 
> We do not have to build jtreg for every platform. We can just have a job step that does it once, and stores it in the cache for all dependent jobs to use. It would also save some build time across various jobs.

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.

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PR Comment: https://git.openjdk.org/jdk/pull/21692#issuecomment-2438038504