feat(linting): Add support for linting decK files (#981) #2081

Job	Run time
integration (kong:1.4.3)	2m 14s
integration (kong:1.5.1)	2m 18s
integration (kong:2.0.5)	2m 33s
integration (kong:2.1.4)	2m 1s
integration (kong:2.2.2)	1m 43s
integration (kong:2.3.3)	1m 51s
integration (kong:2.4.1)	1m 51s
integration (kong:2.5.1)	1m 53s
integration (kong:2.6.0)	1m 46s
integration (kong:2.7)	2m 0s
integration (kong:2.8)	1m 50s
integration (kong:3.0)	2m 29s
integration (kong:3.1)	2m 20s
integration (kong:3.2)	2m 3s
integration (kong:3.3)	1m 52s
integration (kong/kong:master-alpine)	2m 11s
	32m 55s

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