Add dockerfile linting #497

Job	Run time
Create sdist and Python 3 Wheel	33s
Test Documentation	35s
Test Typing (wheel)	38s
Create Python 2 Wheel	40s
Test Typing (sdist)	41s
Test Package (2.7, sdist)	13s
Test Package (3.4, wheel)	16s
Test Package (3.3, sdist)	14s
Test Package (2.7, wheel)	12s
Test Package (3.5, wheel)	15s
Test Package (3.4, sdist)	13s
Test Package (3.5, sdist)	17s
Test Package (3.6, wheel)	16s
Test Package (3.6, sdist)	15s
Test Package (3.3, wheel)	16s
Test Package (3.9, sdist)	21s
Test Package (3.7, wheel)	14s
Test Package (3.8, wheel)	14s
Test Package (3.9, wheel)	19s
Test Package (3.8, sdist)	13s
Test Package (3.7, sdist)	16s
Test Package (3.12, sdist)	25s
Test Package (3.13, sdist)	26s
Test Package (3.10, wheel)	26s
Test Package (3.12, wheel)	23s
Test Package (3.10, sdist)	26s
Test Package (3.13, wheel)	25s
Test Package (3.11, sdist)	26s
Test Package (3.11, wheel)	23s
	10m 31s

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