Function from_resource 

pub fn from_resource(
    project: &str,
    resource_name: &str,
    kind: &ResourceKind,
) -> Result<ResolvedResource>

Build a ContainerSpec from a manifest resource declaration.

Applies the v0 defaults documented in docs/spec/manifest-v0.md: version expansion to official images, database name derived from the resource name, default ports, healthcheck materialisation.