Adds Alpine build CI job to the GitHub actions matrix. Currently this only builds hotspot. I can add tests too if people think that would be useful but for now I've left it as just build.
------------- Commit messages: - fix test bundle - add make-target: 'hotspot' - 8282944: GHA: Add Alpine Linux x86_64 pre-integration check Changes: https://git.openjdk.org/jdk/pull/20577/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20577&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8282944 Stats: 140 lines in 3 files changed: 139 ins; 0 del; 1 mod Patch: https://git.openjdk.org/jdk/pull/20577.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20577/head:pull/20577 PR: https://git.openjdk.org/jdk/pull/20577
