support singularity-ce

[mr-c]

Fixes #1545

[codecov]

Codecov Report

Merging #1547 (b4f2519) into main (5f99327) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1547      +/-   ##
==========================================
- Coverage   65.87%   65.86%   -0.02%     
==========================================
  Files          91       91              
  Lines       16057    16061       +4     
  Branches     4136     4138       +2     
==========================================
  Hits        10578    10578              
- Misses       4349     4351       +2     
- Partials     1130     1132       +2     

Impacted Files	Coverage Δ
cwltool/singularity.py	58.76% <0.00%> (-0.57%)	⬇️
singularity.py	52.60% <0.00%> (-0.51%)	⬇️

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[cwl-bot]

This pull request has been mentioned on Common Workflow Language Discourse. There might be relevant details there:

https://cwl.discourse.group/t/singularity-not-found-but-installed/488/2