Fix: [Actions] Give Universal Mac packages the "universal" suffix

.github/workflows/release.yml

@@ -454,6 +454,7 @@ jobs:
           -DCMAKE_BUILD_TYPE=RelWithDebInfo \
           -DCPACK_BUNDLE_APPLE_CERT_APP=${{ secrets.APPLE_DEVELOPER_CERTIFICATE_ID }} \
           "-DCPACK_BUNDLE_APPLE_CODESIGN_PARAMETER=--deep -f --options runtime" \
+          -DAPPLE_UNIVERSAL_PACKAGE=1 \
           # EOF
         echo "::endgroup::"
 

cmake/InstallAndPackage.cmake

@@ -101,7 +101,11 @@ if(APPLE)
     set(CPACK_GENERATOR "Bundle")
     include(PackageBundle)
 
+    if (APPLE_UNIVERSAL_PACKAGE)
+        set(CPACK_PACKAGE_FILE_NAME "openttd-#CPACK_PACKAGE_VERSION#-macos-universal")
+    else()
         set(CPACK_PACKAGE_FILE_NAME "openttd-#CPACK_PACKAGE_VERSION#-macos-${CPACK_SYSTEM_NAME}")
+	endif()
 elseif(WIN32)
     set(CPACK_GENERATOR "ZIP")
     if(OPTION_USE_NSIS)