trivy-app release v0.18.1

Fixed

• The helm.sh/chart label is valid for long chart versions: the 63-character cut trims the whole trailing run of -, . and _.

Changed

• Update the README: fix broken documentation links, recommend installing via Flux HelmRelease with kubectl gs deploy chart, replace the obsolete Trivy modules example, and describe the vendir-based upstream sync.
• Allow additional properties for vendored upstream chart values so upstream keys are not rejected by the generated schema.