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ci: smoke-check a rendered page before merge, not only after deploy (… #423

Job	Run time
Node floor	8s
build	2m 23s
Deploy docs / Publish the tested Worker	1m 13s
Deploy docs / Smoke-check the live site	12s
Deploy docs / Roll back the bad version	-1s
Deploy docs / File or update the failure card	0s
	3m 55s