Merge pull request #544 from JiaweiGithub/feat/gateway_doc #1371

Job	Run time
Build binary	1m 21s
Check helm package	11s
Docker image build	2m 41s
Docker cross build images	7m 45s
E2e test	6m 21s
Verify vendor, licenses, do lint	2m 32s
	20m 51s

Provide feedback