[release-21.0] Release of `v21.0.0-RC2` (#17022) #379

Job	Run time
Build and push lite (latest)	4m 15s
Build and push lite (percona80)	4m 21s
Build and push vttestserver (mysql80)	2m 40s
Build and push (bullseye, vtadmin)	1m 24s
Build and push (bullseye, vtorc)	49s
Build and push (bullseye, vtgate)	1m 14s
Build and push (bullseye, vttablet)	56s
Build and push (bullseye, mysqlctld)	51s
Build and push (bullseye, mysqlctl)	57s
Build and push (bullseye, vtctl)	47s
Build and push (bullseye, vtctlclient)	49s
Build and push (bullseye, vtctld)	1m 35s
Build and push (bullseye, vtctldclient)	59s
Build and push (bullseye, logrotate)	45s
Build and push (bullseye, logtail)	30s
Build and push (bullseye, vtbackup)	54s
Build and push (bullseye, vtexplain)	54s
Build and push (bookworm, vtadmin)	1m 26s
Build and push (bookworm, vtorc)	56s
Build and push (bookworm, vtgate)	55s
Build and push (bookworm, vttablet)	44s
Build and push (bookworm, mysqlctld)	59s
Build and push (bookworm, mysqlctl)	51s
Build and push (bookworm, vtctl)	53s
Build and push (bookworm, vtctlclient)	50s
Build and push (bookworm, vtctld)	1m 41s
Build and push (bookworm, vtctldclient)	1m 2s
Build and push (bookworm, logrotate)	21s
Build and push (bookworm, logtail)	45s
Build and push (bookworm, vtbackup)	50s
Build and push (bookworm, vtexplain)	55s
Slack Notification if failed	0s
	37m 48s

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