Document GitHub release automation #564

Job	Run time
ruff	9s
mypy	24s
production-policy	21s
compose-validation	8s
helm-kubeconform	10s
format	12s
coverage	27s
docker-build (platform-master, docker/Dockerfile.master)	23s
docker-build (platform, docker/Dockerfile.validator)	25s
docker-publish (platform, docker/Dockerfile.validator)	49s
docker-publish (platform-master, docker/Dockerfile.master)	51s
github-release	0s
	4m 19s

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