Merge pull request #775 from cybozu-go/issue-772 #1169

Job	Run time
Supported Kubernetes versions End-to-End Tests (8.4.4, 1.29.4)	1h 30m 12s
Supported Kubernetes versions End-to-End Tests (8.4.4, 1.30.4)	1h 29m 48s
Integration tests with MySQL (8.0.28)	6m 42s
Supported Kubernetes versions End-to-End Tests (8.4.4, 1.31.0)	1h 29m 21s
Integration tests with MySQL (8.0.39)	6m 33s
Supported MySQL versions End-to-End Tests (8.0.28, 1.31.0)	1h 28m 15s
Upgrade Test	17m 41s
Integration tests with MySQL (8.0.40)	6m 41s
Supported MySQL versions End-to-End Tests (8.0.39, 1.31.0)	1h 31m 3s
Integration tests with MySQL (8.0.41)	6m 29s
Supported MySQL versions End-to-End Tests (8.0.40, 1.31.0)	1h 31m 7s
Integration tests with MySQL (8.4.4)	6m 40s
Supported MySQL versions End-to-End Tests (8.0.41, 1.31.0)	1h 31m 53s
Supported MySQL versions End-to-End Tests (8.4.4, 1.31.0)	1h 29m 0s
Confirm finishing all tests	1s
	12h 51m 26s

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