Added support for Singularity environment variables  and , enabling pre-fetching of images when executing workflows with the --singularity flag on an HPC without network access (#695)
Added support for Singularity environment variables  and , enabling pre-fetching of images when executing workflows with the --singularity flag on an HPC without network access (#695)


dleehr/cwltool,dleehr/cwltool,dleehr/cwltool,common-workflow-language/cwltool,common-workflow-language/cwltool,common-workflow-language/cwltool,dleehr/cwltool