added e2e tests (#96) #52

Job	Run time
Build and push nimbus image / release-image	3m 28s
Build and push nimbus-kyverno adapter's image / release-image	7m 32s
Build and push nimbus-netpol adapter's image / release-image	3m 56s
Build and push nimbus-kubearmor adapter's image / release-image	3m 52s
	18m 48s

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