Use Mambaforge and cache dependencies

[codecov-commenter]

Codecov Report

Merging #23 (150f68e) into master (52b1a1c) will not change coverage. The diff coverage is n/a.

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@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   80.35%   80.35%           
=======================================
  Files          12       12           
  Lines         667      667           
=======================================
  Hits          536      536           
  Misses        131      131           

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[ctrueden]

Ahh, I guess the work in this PR was already accomplished by e64477a5a1e8f47ce0beb88c580d1c67676a1dfe.