Merge pull request #185 from cybozu-go/bump-mantle-chart-0.3.7 #864

Job	Run time
build (3Mi, backup-failure)	29m 13s
build (3Mi, change-to-secondary)	28m 10s
build (3Mi, incr-backup)	32m 30s
build (3Mi, change-to-primary)	27m 5s
build (3Mi, change-to-standalone)	21m 35s
build (3Mi, full-backup)	26m 52s
build (10Mi, various-transfer-part-size)	26m 19s
build (3Mi, !//)	35m 52s
build (200Gi, various-transfer-part-size)	20m 24s
	4h 8m 0s

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