Add internal/util/yaml.go

internal/util/yaml.go

@@ -0,0 +1,14 @@
+package util
+
+import (
+	"bytes"
+
+	"gopkg.in/yaml.v3"
+)
+
+// YamlUnmarshalStrict unmarshals YAML data with an error when unknown fields are present.
+func YamlUnmarshalStrict(in []byte, out interface{}) error {
+	dec := yaml.NewDecoder(bytes.NewReader(in))
+	dec.KnownFields(true)
+	return dec.Decode(out)
+}