Fix error on unrecognized configuration keys

- Error while loading configuration with unrecognized keys
- Do not start if failed to load configuration from file

internal/hook/hook.go

@@ -774,7 +774,13 @@ func (h *Hooks) LoadFromFile(path string, asTemplate bool) error {
 		file = buf.Bytes()
 	}
 
-	return yaml.Unmarshal(file, h)
+	toJSON, err := yaml.YAMLToJSON(file)
+	if err != nil {
+		return err
+	}
+	jsonDecoder := json.NewDecoder(bytes.NewBuffer(toJSON))
+	jsonDecoder.DisallowUnknownFields()
+	return jsonDecoder.Decode(h)
 }
 
 // Append appends hooks unless the new hooks contain a hook with an ID that already exists