try for macos universal >=10.13

.github/workflows/release.yml

@@ -10,7 +10,8 @@ on:
 jobs:
   release:
     env:
-      MACOSX_DEPLOYMENT_TARGET: 10.15
+      MACOSX_DEPLOYMENT_TARGET: 10.13
+      EXTRA_FLAGS: ${{ matrix.os.name == 'macos' && 'CXXFLAGS="-arch x86_64 -arch arm64"'|| ''}}
       BUTLER_API_KEY: ${{ secrets.BUTLER_API_KEY }}
       PROD_MACOS_CERTIFICATE: '${{ secrets.PROD_MACOS_CERTIFICATE }}'
       PROD_MACOS_CERTIFICATE_PWD: '${{ secrets.PROD_MACOS_CERTIFICATE_PWD }}'
@@ -66,7 +67,7 @@ jobs:
         run: 'sudo ./.github/workflows/scripts/linux/install-tgui.sh'
         if: ${{ matrix.os.name == 'ubuntu' }}
       - name: Build
-        run: '${{ matrix.os.scons-script }} test=false debug=$DEBUG_FLAG'
+        run: '${{ matrix.os.scons-script }} test=false debug=$DEBUG_FLAG $EXTRA_FLAGS'
         shell: bash
 
       - name: Download fix-rpaths.py script