docs(readme): add mention to trivy #13

Job	Run time
test (trivy, mcr.microsoft.com/devcontainers/base:ubuntu)	1m 28s
test (sbom, mcr.microsoft.com/devcontainers/base:ubuntu)	58s
test (sbom, debian:latest)	1m 3s
test (sbom, ubuntu:latest)	1m 7s
test (trivy, ubuntu:latest)	1m 43s
test (trivy, debian:latest)	1m 41s
	8m 0s

Provide feedback