Increase timeout to 300s

cmake/CMakeDMGSetup.script

@@ -1,6 +1,9 @@
 on run argv
 set image_name to item 1 of argv
 
+-- Increase timeout from default 120 seconds to 300 seconds
+-- to account for slower CI environments (especially Intel runners)
+with timeout of 300 seconds
     tell application "Finder"
         tell disk image_name
 
@@ -51,4 +54,5 @@ tell disk image_name
         end tell
         delay 1
     end tell
+end timeout
 end run