build

Provide python3 to github actions testreport #94

Job	Run time
doc_html	3m 1s
forward (offline_exf_seaice)	4m 21s
forward (global_ocean.cs32x15)	3m 43s
openad-other	0s
doc_latex	4m 7s
forward (tutorial_deep_convection)	2m 36s
forward (aim.5l_cs)	1m 43s
forward (isomip)	2m 53s
forward (global_ocean.90x40x15)	1m 57s
forward (tutorial_plume_on_slope)	1m 39s
forward (tutorial_advection_in_gyre)	1m 13s
forward (hs94.cs-32x32x5)	1m 42s
forward (tutorial_global_oce_biogeo)	1m 28s
forward (tutorial_global_oce_in_p)	1m 27s
forward (tutorial_cfc_offline)	1m 9s
openad (global_ocean.90x40x15)	9m 13s
	42m 12s

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