[release-21.0] Release of `v21.0.0` (#17082) #390

Job	Run time
Build and push lite (latest)	4m 10s
Build and push vttestserver (mysql80)	2m 20s
Build and push lite (percona80)	4m 21s
Build and push (bullseye, vtadmin)	1m 14s
Build and push (bullseye, vtorc)	40s
Build and push (bullseye, vtgate)	52s
Build and push (bullseye, vttablet)	53s
Build and push (bullseye, mysqlctld)	39s
Build and push (bullseye, mysqlctl)	50s
Build and push (bullseye, vtctl)	49s
Build and push (bullseye, vtctlclient)	52s
Build and push (bullseye, vtctld)	1m 38s
Build and push (bullseye, vtctldclient)	53s
Build and push (bullseye, logrotate)	31s
Build and push (bullseye, logtail)	26s
Build and push (bullseye, vtbackup)	51s
Build and push (bullseye, vtexplain)	49s
Build and push (bookworm, vtadmin)	1m 34s
Build and push (bookworm, vtorc)	51s
Build and push (bookworm, vtgate)	52s
Build and push (bookworm, vttablet)	48s
Build and push (bookworm, mysqlctld)	47s
Build and push (bookworm, mysqlctl)	56s
Build and push (bookworm, vtctl)	59s
Build and push (bookworm, vtctlclient)	43s
Build and push (bookworm, vtctld)	2m 1s
Build and push (bookworm, vtctldclient)	55s
Build and push (bookworm, logrotate)	25s
Build and push (bookworm, logtail)	37s
Build and push (bookworm, vtbackup)	43s
Build and push (bookworm, vtexplain)	54s
Slack Notification if failed	0s
	35m 53s

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