CWl and toil singularity image e.g busybox? Thank you

Question

[Fadi]

I am new to CWL and toil. Can someone suggest a simple "hello world" sort of example to use singularity image e.g busybox? Obviously this command doesnt work: toil-cwl-runner --jobStore my_jobStore --singularity --singularity-image busybox example.cwl example-job.yml

[Ram]

How is this related to bioinformatics?