switch to github builders #1988

Job	Run time
typecheck / typecheck	4m 10s
units / 🧪 Unit Tests	3m 15s
publish-webapp / publish	2m 7s
publish-worker / build (coordinator)	1m 27s
publish-worker / build (docker-provider)	52s
publish-worker / build (kubernetes-provider)	43s
	12m 34s

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