chore: migrate image registry from hkccr to ghcr.io #777

Job	Run time
e2e-test (apisix, networking.k8s.io)	33m 52s
e2e-test (apisix, apisix.apache.org)	31m 36s
e2e-test (apisix-standalone, apisix.apache.org)	29m 21s
e2e-test (apisix, webhook)	34m 40s
e2e-test (apisix-standalone, webhook)	32m 22s
e2e-test (apisix-standalone, networking.k8s.io)	32m 13s
	3h 14m 4s

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