update from macos-13 to macos-15 build runner and add support for apple silicon builds

.github/workflows/build.yml

@@ -45,7 +45,10 @@ jobs:
           artifacts: "dist/*-win-installer.exe,dist/*-win-portable.exe"
 
   build_mac:
-    runs-on: macos-13
+    strategy:
+      matrix:
+        os: [ macos-15, macos-15-intel ]
+    runs-on: ${{ matrix.os }}
     permissions:
       contents: write
     steps:
@@ -80,7 +83,7 @@ jobs:
           replacesArtifacts: true
           omitDraftDuringUpdate: true
           omitNameDuringUpdate: true
-          artifacts: "dist/*-mac.dmg"
+          artifacts: "dist/*-mac-*.dmg"
 
   build_linux:
     runs-on: ubuntu-latest

package.json

@@ -33,7 +33,7 @@
     "mac": {
       "target": "dmg",
       "identity": null,
-      "artifactName": "ReticulumMeshChat-v${version}-${os}.${ext}",
+      "artifactName": "ReticulumMeshChat-v${version}-${os}-${arch}.${ext}",
       "extendInfo": {
         "NSMicrophoneUsageDescription": "Microphone access is only needed for Audio Calls",
         "com.apple.security.device.audio-input": true