Update ci.yml: clean up space after each test

[smilesun]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.25%. Comparing base (f4b9c1e) to head (b63b8e5).
Report is 21 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #889   +/-   ##
=======================================
  Coverage   95.25%   95.25%           
=======================================
  Files         133      133           
  Lines        5291     5291           
=======================================
  Hits         5040     5040           
  Misses        251      251           

Flag	Coverage Δ
unittests	95.25% <ø> (ø)

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