add codecov token secret to CI.yml

[wheeheee]

also added CODECOV_TOKEN Dependabot repository secret

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6c6f4fa) 97.29% compared to head (9dd734f) 97.46%.
Report is 20 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #525      +/-   ##
==========================================
+ Coverage   97.29%   97.46%   +0.17%     
==========================================
  Files          18       18              
  Lines        3105     3080      -25     
==========================================
- Hits         3021     3002      -19     
+ Misses         84       78       -6     

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[wheeheee]

Do we want CI to fail if the Codecov upload errors?
I could add fail_ci_if_error: true if this is desired.

[ViralBShah]

I don't think we want CI to fail in case codecov upload errors. Let's see how it works out for the foreseeable future, and if we need to be more strict.

[ViralBShah]

It seems that the general consensus is that we should use fail_ci_if_error: true. @wheeheee would you be able to add that in a new PR? Sorry for setting you on the wrong path here.