8361478: GHA: Use MSYS2 from GHA runners

[shipilev]

Installing MSYS2 takes considerable time in our Windows workflows. Fortunately, GHA runners currently ship with MSYS2 bundled! The docs for setup-msys2 step say it is enough to say release: false to use those:
https://github.com/msys2/setup-msys2?tab=readme-ov-file#release

Also bumping the action version to gain access to the actual installed path.

Additional testing:

• GHA

---

Progress

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Issue

• JDK-8361478: GHA: Use MSYS2 from GHA runners (Enhancement - P4)

Reviewers

• Julian Waters (@TheShermanTanker - Committer)

Reviewing

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[mlbridge]

Webrevs

• 00: Full (32328a28)

[TheShermanTanker]

I recall there were some issues with using MSYS2 that comes with Actions. That was a long time ago though, are they no longer a problem with current Actions and MSYS2 versions?

[shipilev]

I recall there were some issues with using MSYS2 that comes with Actions. That was a long time ago though, are they no longer a problem with current Actions and MSYS2 versions?

We used to have a problem building jtreg, so we pinned and later unpinned the version: JDK-8310259. But today, we do not build jtreg on Windows at all. And we have not seen any issues with MSYS2 since. So I think it is okay to bump the version now. We can retract it back if we find problems, it would only require rewiring the PATH a bit awkwardly.

[TheShermanTanker]

I think the problem was something else about Actions MSYS2 not being usable, but alas I can't remember enough to actually make a valid point. So this gets a +1 from me since it can easily be backed out if it does cause issues. I'm not a Reviewer though, so you'll have to wait for Magnus to take a look at this

[shipilev]

Hey @magicus ;)