build

Switch to docker image with python3 #92

Job	Run time
doc_html	2m 49s
openad (global_ocean.90x40x15)	9m 26s
forward (offline_exf_seaice)	4m 24s
doc_latex	4m 3s
forward (global_ocean.cs32x15)	3m 28s
openad-other	0s
forward (tutorial_deep_convection)	2m 40s
forward (aim.5l_cs)	1m 39s
forward (isomip)	3m 2s
forward (global_ocean.90x40x15)	1m 58s
forward (tutorial_plume_on_slope)	1m 58s
forward (tutorial_advection_in_gyre)	1m 19s
forward (hs94.cs-32x32x5)	1m 44s
forward (tutorial_global_oce_biogeo)	1m 41s
forward (tutorial_global_oce_in_p)	1m 17s
forward (tutorial_cfc_offline)	1m 14s
	42m 42s

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