feat: move mirror ci to publish step #587

Job	Run time
check-flavor	4s
validate (install, upstream) / run	4m 43s
validate (install, registry1) / run	4m 26s
validate (install, unicorn) / run	4m 48s
validate (upgrade, registry1) / run	4m 33s
validate (upgrade, unicorn) / run	3m 52s
validate (upgrade, upstream) / run	4m 7s
	26m 33s

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