promote the current EC version to the stable channel on release #246

Job	Run time
buildtools	32s
get-tag	4s
publish-images	2m 21s
Determine previous stable version	6s
publish-operator-image	3m 22s
publish-operator-chart	10s
release	3m 50s
Create app releases	18s
Download the current release binary	36s
E2E (TestResetAndReinstallAirgap)	22m 58s
E2E (TestSingleNodeAirgapUpgrade)	21m 49s
E2E (TestSingleNodeDisasterRecoveryWithProxy)	18m 54s
E2E (TestProxiedEnvironment)	23m 5s
E2E (TestProxiedCustomCIDR)	22m 13s
E2E (TestInstallWithPrivateCAs)	10m 19s
E2E (TestInstallWithMITMProxy)	21m 16s
E2E (TestMultiNodeAirgapUpgrade, embedded-cluster)	23m 56s
E2E (TestAirgapUpgradeFromEC18, embedded-cluster)	33m 27s
E2E (TestMultiNodeAirgapUpgradePreviousStable, embedded-cluster)	28m 57s
Validate success	1s
	3h 58m 14s

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