Code review ostensibly takes place inside a container runtime just like tests or other actions would. It makes sense to me.

but consumes vastly more resources than most app's build process.

Done that way it obfuscates cost of the code review and I think that's on purpose

	▲	whalesalad 2 days ago \| parent [-]
		The cost of running a container (to github) is someone else not being able to run a container.