RFR: 8334731: GHA: build on macOS / aarch64 [v2]

[Kevin Rushforth]

> GitHub Actions: add a macOS / aarch64 build using a macOS 14 test runner and a macOS / aarch64 boot JDK. This is a brute force approach that duplicates the job config (I don't want to spend the time to figure out how to parameterize the `.yaml` script).

Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:

  Add a note about duplicated logic

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1484/files
  - new: https://git.openjdk.org/jfx/pull/1484/files/ef2c221b..8efda242

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1484&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1484&range=00-01

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx/pull/1484.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1484/head:pull/1484

PR: https://git.openjdk.org/jfx/pull/1484