Merge pull request #755 from cybozu-go/issue-753 #1111

Job	Run time
Integration tests with MySQL (8.0.28)	6m 32s
Supported Kubernetes versions End-to-End Tests (8.4.3, 1.29.4)	1h 30m 7s
Integration tests with MySQL (8.0.37)	6m 37s
Supported Kubernetes versions End-to-End Tests (8.4.3, 1.30.4)	1h 29m 28s
Integration tests with MySQL (8.0.39)	6m 44s
Supported MySQL versions End-to-End Tests (8.0.28, 1.31.0)	1h 30m 22s
Supported Kubernetes versions End-to-End Tests (8.4.3, 1.31.0)	1h 30m 5s
Integration tests with MySQL (8.0.40)	6m 39s
Supported MySQL versions End-to-End Tests (8.0.37, 1.31.0)	1h 31m 33s
Integration tests with MySQL (8.4.3)	6m 24s
Supported MySQL versions End-to-End Tests (8.0.39, 1.31.0)	1h 31m 7s
Supported MySQL versions End-to-End Tests (8.0.40, 1.31.0)	1h 30m 57s
Upgrade Test	17m 57s
Supported MySQL versions End-to-End Tests (8.4.3, 1.31.0)	1h 29m 57s
Confirm finishing all tests	1s
	12h 54m 30s

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