feat: enable support for implementing additional checks in gitops validation

Author: Yann Rouillard

kp_pre_commit_hooks/gitops-values-validation.py

@@ -211,7 +211,10 @@ def __init__(self, service_instance_config: ServiceInstanceConfig):
 
     @cached_property
     def validator(self) -> Validator:
-        return Draft7Validator(self.service_instance_config.helm_chart.json_schema, registry=SCHEMA_REGISTRY)  # type: ignore
+        validator_class = validators.validates("draft7")(
+            validators.extend(Draft7Validator, validators={"additionalChecks": self.validate_additional_checks})
+        )
+        return validator_class(self.service_instance_config.helm_chart.json_schema, registry=SCHEMA_REGISTRY)
 
     def validate_configuration(self) -> Sequence[Union[ValidationError, SchemaValidationError]]:
         try:
@@ -238,6 +241,11 @@ def iter_schema_validation_errors(self) -> Iterator[SchemaValidationError]:
                     hint="This pre-commit hook will auto-fix this issue. Please commit the values files changes.",
                 )
 
+    def validate_additional_checks(self, validator, additional_checks, value, schema):
+        for check in additional_checks:
+            if check_method := getattr(self, f"validate_{camel_to_snake(check)}", None):
+                yield from check_method(value, schema)
+
 
 def format_error(error: Union[ValidationError, SchemaValidationError]):
     if isinstance(error, SchemaValidationError):