fix docker image

[loeffel-io]

• fix docker image to make it easier to run ls-lint inside docker

[codecov-commenter]

Codecov Report

Merging #77 (00470b4) into master (3d00746) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #77   +/-   ##
=======================================
  Coverage   66.89%   66.89%           
=======================================
  Files          13       13           
  Lines         441      441           
=======================================
  Hits          295      295           
  Misses        129      129           
  Partials       17       17           

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