Add dockerfile linting #490

Job	Run time
Create sdist and Python 3 Wheel	30s
Create Python 2 Wheel	42s
Test Documentation	35s
Test Typing (wheel)	36s
Test Typing (sdist)	43s
Test Package (3.4, sdist)	14s
Test Package (3.3, sdist)	14s
Test Package (3.4, wheel)	14s
Test Package (3.3, wheel)	15s
Test Package (3.5, sdist)	14s
Test Package (2.7, wheel)	13s
Test Package (3.5, wheel)	15s
Test Package (2.7, sdist)	17s
Test Package (3.6, sdist)	14s
Test Package (3.6, wheel)	14s
Test Package (3.11, sdist)	40s
Test Package (3.9, sdist)	22s
Test Package (3.8, sdist)	14s
Test Package (3.7, sdist)	16s
Test Package (3.12, sdist)	25s
Test Package (3.12, wheel)	22s
Test Package (3.13, sdist)	30s
Test Package (3.8, wheel)	17s
Test Package (3.10, wheel)	25s
Test Package (3.7, wheel)	14s
Test Package (3.13, wheel)	23s
Test Package (3.10, sdist)	29s
Test Package (3.9, wheel)	20s
Test Package (3.11, wheel)	23s
	10m 50s

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