Minor additional improvements to conda script

[bwohlberg]

Minor additional improvements to conda script

[codecov]

Codecov Report

Merging #270 (80a88dd) into main (492e172) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   93.94%   93.94%           
=======================================
  Files          50       50           
  Lines        3681     3681           
=======================================
  Hits         3458     3458           
  Misses        223      223           

Flag	Coverage Δ
unittests	93.94% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
scico/linop/optics.py	99.13% <ø> (ø)

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