
Update `launch.script` so that the `run_user` variable is only set when the user actually exists. Prior to this commit, if the jar file was owned by a non-existing user the startup script could fail. Fixes gh-29370
Update `launch.script` so that the `run_user` variable is only set when the user actually exists. Prior to this commit, if the jar file was owned by a non-existing user the startup script could fail. Fixes gh-29370