Forces HELM to use auto settings as output_type (#1278)

Fixes #

## Proposed Changes

* Forces the helm input_type to autodetect extension

## Docs and Tests

* [ ] Tests added
* [ ] Updated documentation

examples/kubernetes/inventory/classes/component/nginx-helm.yml

@@ -14,6 +14,7 @@ parameters:
     compile:
       - output_path: .
         input_type: helm
+        output_type: yaml # this tests that helm switches to auto output type
         input_paths:
           - charts/nginx-ingress
         helm_values:

kapitan/inputs/helm.py

@@ -13,7 +13,7 @@
 
 from kapitan.errors import HelmTemplateError
 from kapitan.helm_cli import helm_cli
-from kapitan.inputs.base import CompiledFile, InputType
+from kapitan.inputs.base import InputType
 from kapitan.inputs.kadet import BaseModel, BaseObj
 from kapitan.inventory.model.input_types import KapitanInputTypeHelmConfig
 

kapitan/inventory/model/input_types.py

@@ -1,9 +1,12 @@
+import logging
 from typing import Annotated, List, Literal, Optional, Union
 
-from pydantic import BaseModel, ConfigDict, Field
+from pydantic import BaseModel, ConfigDict, Field, field_validator
 
 from kapitan.utils import StrEnum
 
+logger = logging.getLogger(__name__)
+
 
 class InputTypes(StrEnum):
     JSONNET = "jsonnet"
@@ -72,6 +75,13 @@ class KapitanInputTypeHelmConfig(KapitanInputTypeBaseConfig):
     helm_path: Optional[str] = None
     kube_version: Optional[str] = None
 
+    @field_validator("output_type")
+    @classmethod
+    def type_must_be_auto(cls, _: OutputType) -> OutputType:
+        """Helm output type must be auto."""
+        logger.debug("field `output_type` for helm input type must be set to 'auto': enforcing.")
+        return OutputType.AUTO
+
 
 class KapitanInputTypeKadetConfig(KapitanInputTypeBaseConfig):
     input_type: Literal[InputTypes.KADET] = InputTypes.KADET