Resource Validation for undefined inputs

[damyngz]

Hello!

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Issue details

I want to be able to detect undefined inputs for a resource like say, a helm Release resource

{
            name: "helm-release-unfixed-version",
            description: "Prevents Helm Release from having unspecified version.",
            enforcementLevel: "mandatory",
            validateResource: validateResourceOfType(k8s.helm.v3.Release, (resource, args, reportViolation) => {
                if (args.props.version == undefined) {
                    reportViolation("You must fix the version of the helm release.");
                }
            }),
}

This can be traditionally achieved via a stackTransformation like so:

pulumi.runtime.registerStackTransformation((resource) => {
        if (resource.type === "kubernetes:helm.sh/v3:Release") {
            if (resource.props.version === undefined) { throw new pulumi.RunError(`helm version if unfixed for release: ${resource.name}`) }
        } return undefined
    })

but I would prefer to do it via policy validation if possible so i dont have to litter the stack with transformations.

Affected area/feature

[tgummerer]

Thanks for the suggestion! That seems like a reasonable enhancement request to me.