Explain new Supply Chain characteristics in the docs (#665) #699

Job	Run time
docker (one-enterprise, ubuntu-24.04-arm, arm64, enterprise/Dockerfile)	10m 33s
docker (one, ubuntu-24.04-arm, arm64, Dockerfile)	40s
docker (one, ubuntu-24.04, amd64, Dockerfile)	24s
docker (one-enterprise, ubuntu-24.04, amd64, enterprise/Dockerfile)	8m 16s
docker-multi-arch (one)	25s
docker-multi-arch (one-enterprise)	21s
enterprise-cosign	48s
release	5s
public	3m 9s
	24m 41s

Provide feedback