Add release-21.0 to the Golang Upgrade workflow (#16916) #394

Job	Run time
Build and push lite (latest)	4m 14s
Build and push lite (percona80)	4m 29s
Build and push vttestserver (mysql80)	2m 32s
Build and push (bullseye, vtadmin)	1m 26s
Build and push (bullseye, vtorc)	1m 29s
Build and push (bullseye, vtgate)	43s
Build and push (bullseye, vttablet)	46s
Build and push (bullseye, mysqlctld)	54s
Build and push (bullseye, mysqlctl)	52s
Build and push (bullseye, vtctl)	48s
Build and push (bullseye, vtctlclient)	47s
Build and push (bullseye, vtctld)	1m 31s
Build and push (bullseye, vtctldclient)	44s
Build and push (bullseye, logrotate)	27s
Build and push (bullseye, logtail)	31s
Build and push (bullseye, vtbackup)	47s
Build and push (bullseye, vtexplain)	45s
Build and push (bookworm, vtadmin)	1m 30s
Build and push (bookworm, vtorc)	58s
Build and push (bookworm, vtgate)	51s
Build and push (bookworm, vttablet)	44s
Build and push (bookworm, mysqlctld)	1m 0s
Build and push (bookworm, mysqlctl)	56s
Build and push (bookworm, vtctl)	44s
Build and push (bookworm, vtctlclient)	52s
Build and push (bookworm, vtctld)	1m 48s
Build and push (bookworm, vtctldclient)	48s
Build and push (bookworm, logrotate)	33s
Build and push (bookworm, logtail)	31s
Build and push (bookworm, vtbackup)	51s
Build and push (bookworm, vtexplain)	53s
Slack Notification if failed	0s
	36m 44s

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