cwltool.Dockerfile fix

[mr-c]

No description provided.

[codecov]

Codecov Report

Merging #1549 (38c7493) into main (3df258a) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1549      +/-   ##
==========================================
+ Coverage   65.86%   65.93%   +0.07%     
==========================================
  Files          91       91              
  Lines       16061    16065       +4     
  Branches     4138     4138              
==========================================
+ Hits        10578    10592      +14     
+ Misses       4351     4343       -8     
+ Partials     1132     1130       -2     

Impacted Files	Coverage Δ
cwltool/load_tool.py	82.43% <100.00%> (+0.15%)	⬆️
cwltool/job.py	77.26% <0.00%> (+0.40%)	⬆️
load_tool.py	54.50% <0.00%> (+0.41%)	⬆️
checker.py	89.36% <0.00%> (+4.25%)	⬆️

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