`hdiutil` sometimes errors out with `Resource busy` on CI

[sagudev]

See https://github.com/servo/servo/actions/runs/7400586694/job/20134531339

Run python3 ./mach package --release hdiutil: create failed - Resource busy Creating Servo.app Copying files Swapping prefs Finding dylibs and relinking Adding version to Credits.rtf Creating dmg Packaging MacOS dmg exited with return value 1

We could add retry here or try to make command more resistant to hdiutil problems (can we just skip the error and continue).

[mrobinson]

I was looking into this yesterday and I think the next step is to ensure that whenever we run hdiutil we run with -verbose and ensure that we print the output.