Kubernetes .yaml files fail to validate

[kroese]

When validating files used by Kubernetes, the validation fails:

YAML Validation Results:
  - Passed: 12
  - Failed: 1
  - Skipped: 0
  - Violations: [
  {
    "file": "kubernetes.yml",
    "errors": [
      {
        "path": null,
        "message": "Invalid YAML",
        "error": "YAMLParseError Source contains multiple documents; please use YAML.parseAllDocuments() at line 12, column 1"
      }
    ]
  }

Even though they are valid .yaml files. For an example file see:

https://raw.githubusercontent.com/qemus/qemu-arm/refs/heads/master/kubernetes.yml