run tests on Windows as well as Ubuntu

[nhsavage]

do testing on Window plaform too

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
lib/osop
compare_terciles.py	76	76	0%	9–336
compute_products_func.py	134	134	0%	8–449
compute_scores_func.py	154	154	0%	17–414
ens_plotting.py	142	54	62%	112–148, 240, 250, 318–337, 357–418
plot_verify.py	173	145	16%	89–126, 158–249, 276–309, 339–434, 458–535
pycpt_convert.py	394	287	27%	76–99, 116–122, 140, 163–169, 189–205, 219–225, 242–270, 290, 311–313, 340–531, 554, 569–571, 663, 736–744, 759–765, 776–791, 796–799, 804–808, 816–827, 843–897, 917–971, 1009–1044
run_pycpt.py	126	126	0%	11–362
util.py	59	12	80%	89, 103, 131, 159–172, 179–184
TOTAL	1574	988	37%

Tests	Skipped	Failures	Errors	Time
45	0 💤	0 ❌	0 🔥	13.111s ⏱️

[nhsavage]

can't get the conda env to work o pausing this for now