Add Yaml.createResource() for type-agnostic resource creation from YAML

[Copilot]

Implement YAML resource creation without type differentiation

This PR addresses the issue of submitting arbitrary YAML resources to Kubernetes without having to differentiate between Kind types, similar to kubectl create -f file.yaml.

Implementation Complete

• Add new Yaml.createResource() methods that accept arbitrary YAML and creates resources using the generic client
• Extract apiVersion and kind from unstructured YAML
• Use ModelMapper to determine the strongly typed object class
• Load YAML into the strongly typed object using the same content (vs dump/reload)
• Use GenericKubernetesApi to create the resource in the cluster
• Add comprehensive tests for the new functionality
• Run full test suite to ensure backward compatibility

Technical Implementation

The solution implements three new public methods in the Yaml class:

• Yaml.createResource(ApiClient, String) - Create from YAML string
• Yaml.createResource(ApiClient, File) - Create from YAML file
• Yaml.createResource(ApiClient, Reader) - Create from YAML stream

These methods:

1. Read the YAML content into a string buffer once
2. Parse it first as a Map to extract apiVersion/kind
3. Use ModelMapper to determine the right strongly typed object class
4. Parse the same content again into the strongly-typed object
5. Use GenericKubernetesApi configured with the group/version/kind to create the resource
6. Handle both namespaced and cluster-scoped resources appropriately

Usage Example

ApiClient client = Config.defaultClient();

String yaml = 
    "apiVersion: v1\n" +
    "kind: ConfigMap\n" +
    "metadata:\n" +
    "  name: my-config\n" +
    "  namespace: default\n" +
    "data:\n" +
    "  key: value\n";

// Automatically determines type and creates resource
Object resource = Yaml.createResource(client, yaml);

Original prompt

---

This section details on the original issue you should resolve

<issue_title>how to submit a yaml like kubectl create -f file.yaml ?</issue_title>
<issue_description>Is there a method to submit YAML resources of any type to Kubernetes ?
What I mean is not having to differentiate between Kind types.</issue_description>

<agent_instructions>Extend the kubectl create implementation to take arbitrary yaml and use the generic client to create that resource</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@brendandburns This is not currently possible. You would need to modify the `Yaml` class here:

https://github.com/kubernetes-client/java/blob/master/util/src/main/java/io/kubernetes/client/util/Yaml.java

To load unstructured YAML and then pick out the API group/version/kind and then use the ModelMapper here:
https://github.com/kubernetes-client/java/blob/master/util/src/main/java/io/kubernetes/client/util/ModelMapper.java

To determine the right strongly typed object, and then use Yaml.load again to reload the YAML into that strongly typed object.

Then you would need to pass that object to a GenericApi handler that was configured with the group/version/kind that you found above.

So it's possible, but it will require you to write a bunch of code. If you do, do that, feel free to send a PR.</comment_new>

• Fixes how to submit a yaml like kubectl create -f file.yaml ? #3336

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Copilot
Once this PR has been reviewed and has the lgtm label, please ask for approval from brendandburns. For more information see the Code Review Process.

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[brendandburns]

@copilot Generally looks good. Please remove the markdown doc which is unnecessary and address this comment.

[brendandburns]

Load the Reader into a byte array at the beginning of this function and use the same byte array in both cases vs dumping it back out to YAML.

[Copilot]

Fixed in 1caa15d. Now reads the Reader into a string buffer first and uses the same content for both parsing (to extract apiVersion/kind) and loading into the typed object.

[Copilot]

@copilot Generally looks good. Please remove the markdown doc which is unnecessary and address this comment.

Done in 1caa15d - removed the markdown doc and addressed the code review comment.