dockerfile house keeping

[mqxter]

resolving this error
The system-wide python installation should be maintained using the system
92.69 package manager (apk) only.
92.69
92.69 If the package in question is not packaged already (and hence installable via
92.69 "apk add py3-somepackage"), please consider installing it inside a virtual
92.69 environment, e.g.:

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7d93c7a) 66.27% compared to head (fb1cbb8) 66.27%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #671   +/-   ##
=======================================
  Coverage   66.27%   66.27%           
=======================================
  Files          22       22           
  Lines        2150     2150           
=======================================
  Hits         1425     1425           
  Misses        591      591           
  Partials      134      134           

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[chengfang]

Thanks for reporting the issue and the fix. It will be addressed in #700, as there are already some comments there. Nonetheless, your contribution is much appreciated!