Use NUGET_API_KEY

[martincostello]

Use the NUGET_API_KEY environment variable instead of specifying --api-key.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.10%. Comparing base (a1940a0) to head (8646f8c).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4006   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files         111      111           
  Lines        4005     4005           
  Branches      805      805           
=======================================
  Hits         3809     3809           
  Misses        196      196           

Flag	Coverage Δ
Linux	95.10% <ø> (ø)
Windows	95.10% <ø> (ø)
macOS	95.10% <ø> (ø)

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