RFR: 8299330: Workflows should not install MSYS2 in the JDK's source directory [v9]

[Julian Waters]

> MSYS2 should be more appropriately installed into the runner's temporary directory rather than inside the newly checked out repository containing all the JDK's source code, as doing so may interfere with the build process and cause weird corner cases in the submitted actions workflow

Julian Waters has updated the pull request incrementally with one additional commit since the last revision:

  Install in RUNNER_TOOL_CACHE

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11782/files
  - new: https://git.openjdk.org/jdk/pull/11782/files/46426ac3..937247f0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11782&range=08
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11782&range=07-08

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11782.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11782/head:pull/11782

PR: https://git.openjdk.org/jdk/pull/11782