[crd-generator] Map properties lack additionalProperties

[clement-buchart]

Hello,

I've been migrating some internal operator from the go-based CRD generation to the Java based one. Thanks for this lib.

One issue I had during the migration is that when a Spec Pojo has a Map property (in my case Map<String, String>), the generated property in the schema is of type: object but has no additionalProperties field.

Example property

    private Map<String, String> deploymentProperties;

When using using the Go generator, the generated schema is

            deploymentProperties:
              additionalProperties:
                type: string
              type: object

When using using the Java based generator, the schema is

                deploymentProperties:
                  type: object

This make Kubernetes reject my CustomResource when the map is not empty.

My current workaround is

yq e '.spec.versions.[].schema.openAPIV3Schema.properties.spec.properties.deploymentProperties |= ( . * {"additionalProperties" : {"type" : "string"}})' customresource.yaml