Fix ncpus environment variable ci

[mcbarton]

Description

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Fixes # (issue)

Type of change

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• Bug fix
• New feature
• Requires documentation updates

Testing

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Checklist

• I have read the contribution guide recently

[Vipul-Cariappa]

LGTM!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.69%. Comparing base (130dd30) to head (c7b48db).
⚠️ Report is 56 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #636   +/-   ##
=======================================
  Coverage   78.69%   78.69%           
=======================================
  Files           9        9           
  Lines        3835     3835           
=======================================
  Hits         3018     3018           
  Misses        817      817           

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