Add codecov secret token to CI template

[gdalle]

No description provided.

[gdalle]

@DilumAluthge could it be that this fails because you added an org token and so we need to delete the repo token?

[oxinabox]

feel free to merge once working

[gdalle]

We didn't get a coverage report on this PR, and the Codecov CI log says invalid token. Gonna try deleting the repo token to see if using the org-wide solves it

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c354577) 94.33% compared to head (26fe6f9) 94.33%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #458   +/-   ##
=======================================
  Coverage   94.33%   94.33%           
=======================================
  Files          24       24           
  Lines         742      742           
=======================================
  Hits          700      700           
  Misses         42       42           

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[gdalle]

there we go