[ziaxzulu]

Linux natives currently share classifiers despite depending on glibc, so Alpine JVMs attempt to load incompatible binaries. Add explicit linux-glibc-* / linux-musl-* natives for x86_64 and aarch64, selected automatically by the bundled loader. A single concurrent matrix now builds all eight Linux, Windows, and macOS targets. Publishing waits for all eight jobs to pass.

The loader identifies the libc mapped into the running JVM, including musl with gcompat installed, with an explicit override for environments without procfs. All eight jobs build on matching x86_64 or ARM64 runners. Only musl uses an Alpine 3.22 container. Glibc uses GCC 12 and OpenSSL on Ubuntu 22.04; Windows uses native MSYS2 MINGW64/CLANGARM64 with static OpenSSL; macOS uses its host toolchain. Every job checks lazy and eager bundle loading, native certificate generation, callbacks and peer cleanup in a matching JVM. Windows checks remove toolchain DLL directories from PATH. Linux uses distribution OpenSSL 3 and C++ runtime libraries. Java sources compile with JDK 17 and --release 11, allowing a native Windows ARM64 JDK while preserving Java 11 bytecode/API compatibility.

Explicit users of the old linux-x86_64 / linux-aarch64 classifiers must migrate when upgrading. Other platform classifiers are unchanged. Host development packaging and documentation use the new identifiers too.

Validation:

• Loader and architecture tests passed locally.
• Release glibc and musl x86_64 builds passed locally. A combined bundle containing both natives passed lazy/eager loading and native lifecycle in Ubuntu 22.04 and Alpine 3.22 JVMs, without gcompat.
• Workflow validation passed with actionlint.
• All eight native build jobs and their lazy/eager JVM lifecycle checks passed at fbcea71422136ec8dbdae1bbae14fb57eabfb02a: matrix run. Native regressions passed at the same commit.
• Both host-built glibc binaries require GLIBC 2.34 and GLIBCXX 3.4.30; the ARM64 requirements match the previous cross-built artifact.
• After the JDK toolchain change, loader tests and both local Linux JVM load checks passed; generated main classes retain Java 11 class-file version 55.

Addresses the native packaging cause reported in GeyserMC/Geyser#6738. No Geyser changes are included.