docs: add link to gcp machine type allow list (#1346) #356

Job	Run time
build-and-push / build-and-push-server	5m 20s
lint / actionlint	8s
build-and-push / build-and-push-certifier	1m 31s
lint / golint	1m 53s
lint / shellcheck	1m 4s
unit-tests / unit-test	3m 6s
	13m 2s

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