* fix `nil` parsed of `postCreateCommand` * parse undefined fields to `nil` ptr * Added JSON Unmarshaler with default values * Refactored DevContainer Model Errors * Added `DevContainerJSON` to unmarshal devcontainer.json
* fix `nil` parsed of `postCreateCommand` * parse undefined fields to `nil` ptr * Added JSON Unmarshaler with default values * Refactored DevContainer Model Errors * Added `DevContainerJSON` to unmarshal devcontainer.json