Fix echo command in build docker images workflow #6

Job	Run time
Set push variable	1s
Build and push lite (latest)	2m 9s
Build and push vttestserver (mysql80)	1m 55s
Build and push lite (percona80)	2m 3s
Build and push (bullseye, vtadmin)	1m 7s
Build and push (bullseye, vtorc)	29s
Build and push (bullseye, vtgate)	38s
Build and push (bullseye, vttablet)	42s
Build and push (bullseye, mysqlctld)	56s
Build and push (bullseye, mysqlctl)	38s
Build and push (bullseye, vtctl)	30s
Build and push (bullseye, vtctlclient)	33s
Build and push (bullseye, vtctld)	1m 7s
Build and push (bullseye, vtctldclient)	37s
Build and push (bullseye, logrotate)	16s
Build and push (bullseye, logtail)	19s
Build and push (bullseye, vtbackup)	41s
Build and push (bullseye, vtexplain)	36s
Build and push (bookworm, vtadmin)	1m 9s
Build and push (bookworm, vtorc)	40s
Build and push (bookworm, vtgate)	33s
Build and push (bookworm, vttablet)	44s
Build and push (bookworm, mysqlctld)	42s
Build and push (bookworm, mysqlctl)	40s
Build and push (bookworm, vtctl)	41s
Build and push (bookworm, vtctlclient)	41s
Build and push (bookworm, vtctld)	1m 15s
Build and push (bookworm, vtctldclient)	38s
Build and push (bookworm, logrotate)	27s
Build and push (bookworm, logtail)	24s
Build and push (bookworm, vtbackup)	41s
Build and push (bookworm, vtexplain)	32s
	25m 4s

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