Add CI tests #3

Job	Run time
integration (kong:1.4.3)	1m 22s
integration (kong:1.5.1)	2m 4s
integration (kong:2.0.5)	1m 29s
integration (kong:2.1.4)	1m 48s
integration (kong:2.2.2)	1m 48s
integration (kong:2.3.3)	1m 53s
integration (kong:2.4.1)	1m 53s
integration (kong:2.5.1)	2m 16s
integration (kong:2.6.0)	1m 22s
integration (kong:2.7)	2m 9s
integration (kong:2.8)	1m 25s
integration (kong:3.0)	2m 28s
integration (kong:3.1)	2m 15s
integration (kong:3.2)	1m 27s
integration (kong:3.3)	1m 30s
integration (kong/kong:master-alpine)	2m 5s
	29m 14s

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