Add release instructions to CONTRIBUTING.md (#1509) #3301

Job	Run time
prerequisites	3m 21s
Lint pkg	33s
go-tests	6m 7s
test_integrations (stack-reference)	1m 19s
examples (aws-java-eks-minimal)	2m 25s
test_integrations (stack-transformation)	1m 22s
examples (aws-java-webserver)	2m 32s
test_integrations (adopt-into-component)	1m 33s
test_templates	3m 52s
examples (aws-native-java-s3-folder)	2m 14s
test_integrations (rename)	1m 32s
examples (azure-java-appservice-sql)	1m 59s
test_integrations (rename-component)	1m 25s
examples (azure-java-static-website)	1m 59s
test_integrations (rename-component-and-child)	1m 38s
examples (gcp-java-gke-hello-world)	2m 8s
test_integrations (retype-component)	1m 36s
examples (kubernetes)	1m 33s
test_integrations (retype-parents)	1m 27s
examples (minimal)	2m 4s
examples (minimalsbt)	2m 9s
examples (random)	1m 47s
	46m 35s

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