Cannot use derived schemas when IntOrString present

[clux]

Minor issue when using the fully automatic schemas against something using IntOrString:

error[E0277]: the trait bound `IntOrString: JsonSchema` is not satisfied
   --> tests/./gen.rs:15:15
    |
15  |     pub port: IntOrString,
    |               ^^^^^^^^^^^ the trait `JsonSchema` is not implemented for `IntOrString`
    |
note: required by a bound in `SchemaGenerator::subschema_for`
   --> /home/clux/.cargo/registry/src/github.com-1ecc6299db9ec823/schemars-0.8.8/src/gen.rs:218:38
    |
218 |     pub fn subschema_for<T: ?Sized + JsonSchema>(&mut self) -> Schema {
    |                                      ^^^^^^^^^^ required by this bound in `SchemaGenerator::subschema_for`

error[E0277]: the trait bound `IntOrString: JsonSchema` is not satisfied
 --> tests/./gen.rs:7:64
  |
7 | #[derive(CustomResource, Serialize, Deserialize, Clone, Debug, JsonSchema)]
  |                                                                ^^^^^^^^^^ the trait `JsonSchema` is not implemented for `IntOrString`
  |
  = note: this error originates in the derive macro `JsonSchema` (in Nightly builds, run with -Z macro-backtrace for more info)

some potential solutions:

• get an impl in k8s-openapi
• inline IntOrString with JsonSchema derive (awkward, but avoids user dep on k8s-openapi in some cases perhaps)

This isn't a big deal because it's only the schema part, we can still generate the structs.

Workaround is not use -A or --schema=derived with such schemas, but use --schema=manual or the default and read the schema from a file if needed (if you need to overwrite the crd at some point).