github/workflows: upload test results to codecov

[jluebbe]

No description provided.

[jluebbe]

The resulting output can be seen here: https://app.codecov.io/gh/jluebbe/labgrid/tests/codecov-test

This is a beta feature in Codecov, so this report should become more useful over time.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.6%. Comparing base (89c13b8) to head (7658172).
Report is 2 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master   #1531   +/-   ##
======================================
  Coverage    56.6%   56.6%           
======================================
  Files         168     168           
  Lines       13033   13033           
======================================
  Hits         7385    7385           
  Misses       5648    5648           

Flag	Coverage Δ
3.10	56.6% <ø> (ø)
3.11	56.6% <ø> (ø)
3.12	56.6% <ø> (ø)
3.13	56.6% <ø> (ø)
3.9	56.6% <ø> (ø)

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