Gwydion kindly helped me with the following…. ( his words).
strmqweb is a shell script that sets some environment variables then calls the server start command to start Liberty. But, when you run it with the remote shell command, such as Ansible shell module, when the shell terminates it also kills the JVM child process, which kills the server. The solution is to use nohup when running strmqweb, as described (half way down the page) here: https://ansibledaily.com/execute-detached-process-with-ansible.