Add regression test for net2cog (#94) #40

Job	Run time
build-images (harmony-regression, HarmonyRegression.ipynb) / build-and-publish	9s
build-images (harmony, Harmony.ipynb) / build-and-publish	14s
build-images (geoloco, Geoloco_Regression.ipynb) / build-and-publish	9s
build-images (hga, HGA_Regression.ipynb) / build-and-publish	10s
build-images (hoss, HOSS_Regression.ipynb) / build-and-publish	8s
build-images (hybig, HyBIG_Regression.ipynb) / build-and-publish	14s
build-images (n2z, N2Z_Regression.ipynb) / build-and-publish	9s
build-images (regridder, Regridder_Regression.ipynb) / build-and-publish	12s
build-images (net2cog, net2cog_Regression.ipynb) / build-and-publish	2m 14s
build-images (swath-projector, SwathProjector_Regression.ipynb) / build-and-publish	9s
build-images (trajectory-subsetter, TrajectorySubsetter_Regression.ipynb) / build-and-publish	10s
build-images (variable-subsetter, VariableSubsetter_Regression.ipynb) / build-and-publish	9s
	4m 7s

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