Require at least one action label is specified before merging a PR #178

Job	Run time
Check whether tests need to be run based on diff	19s
Build Flow Aggregator image to be used for Kind e2e tests	2m 32s
Build Antrea image to be used for Kind e2e tests	3m 32s
E2e tests on a Kind cluster on Linux with all features enabled	54m 33s
E2e tests on a Kind cluster on Linux (noEncap)	36m 11s
E2e tests on a Kind cluster on Linux	42m 37s
E2e tests on a Kind cluster on Linux with non default values (proxyAll=true, LoadBalancerMode=DSR...	43m 46s
E2e tests on a Kind cluster on Linux for Flow Visibility	26m 34s
E2e tests on a Kind cluster on Linux (hybrid)	36m 27s
NetworkPolicy conformance tests on a Kind cluster on Linux	8m 0s
Antrea-native (VLAN) secondary network tests on a Kind cluster on Linux	2m 59s
Test installation using 'antctl check' command	3m 51s
API compatible with client version N-1	8m 50s
API compatible with client version N-2	8m 25s
Upgrade from Antrea version N-1	8m 21s
Upgrade from Antrea version N-2	9m 8s
Validate metrics in Prometheus document match running deployment's	1m 47s
Delete uploaded images	6s
	4h 57m 58s

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