Add ARM64 Mac CI file

.github/azure-workflows/build-mac-arm64.yml

+trigger:
+- master
+
+pool:
+  name: Default
+  demands:
+   - agent.name -equals MacStadium-ARM64-Mac
+
+steps:
+- script: mkdir $(Pipeline.Workspace)/build
+  displayName: 'Create build environment'
+
+- script: cmake $(Build.SourcesDirectory) -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_PREFIX_PATH="$(brew --prefix qt@6);$(brew --prefix libarchive)" -DMACOS_BUNDLE_LIBS=ON -DMACOS_BUILD_DMG=ON -DUSE_QT6=ON
+  displayName: 'Configure'
+  workingDirectory: $(Pipeline.Workspace)/build
+  
+- script: make -j$(sysctl -n hw.logicalcpu)
+  displayName: 'Make'
+  workingDirectory: $(Pipeline.Workspace)/build
+
+- publish: $(Pipeline.Workspace)/build/melonDS.dmg
+  artifact: melonDS.dmg
+