Build for both apple silicon and apple intel

[cwisniew]

Identify the Bug or Feature request

Resolves #5987

Description of the Change

Adds native Apple Silicon (ARM64/macOS) builds to the CI pipeline, producing architecture-specific artifacts alongside the existing Intel builds. No Rosetta emulation needed on Apple Silicon Macs.

Possible Drawbacks

Should be none

Documentation Notes

CI Workflows

• .github/workflows/publish.yml — Added macos-15 (ARM64 native) runner to the release matrix alongside macos-15-intel (X86_64). macOS artifacts are now named with -mac-intel and -mac-apple-silicon suffixes respectively (DMG, PKG, and .app.zip).
• .github/workflows/verify-build.yml — Added macos-15 runner to the build verification matrix.

Gradle Build

• build.gradle — The macOS jpackage target platform now conditionally downloads the aarch64 Temurin JDK (OpenJDK21U-jdk_aarch64_mac_hotspot_21.0.1_12.tar.gz) when building on Apple Silicon, instead of the x64 JDK.
• clientserver/build.gradle — Added a macos-aarch64 classifier branch for the WebRTC native library (webrtc-java 0.11.0 already publishes this classifier).
  Native Dependency Compatibility
  All existing native dependencies already support Apple Silicon natively — no version bumps were needed:
• LibGDX 1.13.5 — natives-desktop includes libgdxarm64.dylib (for when we add back in)
• JOGL 2.5.0 — ships universal binaries (natives-macosx-universal) (for when we add back in)
• Zstd-JNI — auto-detects osx-aarch64
• WebP ImageIO — supports ARM64
• JavaFX 22 — plugin auto-resolves mac-aarch64
• JAI ImageIO — pure Java, no native code

Release Notes

Artifact naming (for future releases after this is applied)

Artifact	Architecture
MapTool-1.2.3-mac-intel.dmg	Intel (x86_64)
MapTool-1.2.3-mac-intel.pkg	Intel (x86_64)
MapTool-1.2.3-mac-intel.app.zip	Intel (x86_64)
MapTool-1.2.3-mac-apple-silicon.dmg	Apple Silicon (ARM64)
MapTool-1.2.3-mac-apple-silicon.pkg	Apple Silicon (ARM64)
MapTool-1.2.3-mac-apple-silicon.app.zip	Apple Silicon (ARM64)

---

This change is