Feature Options - Required field

[Sergii Puliaiev (Gorbush)]

In our features we provide a list of options.
https://containers.dev/implementors/features/#options-property

These options are used later in generation of UI for user to fill them out.
Some of the options supposed to be non-empty, but we cannot specify a default value for them.
It would be very helpful if there is an additional property of option - required:boolean which would flag that the value for this particular option is non-blank.

Example:

  "options": {
    "git_branch": {
      "type": "string",
      "default": "",
      "description": "Provide your Git branch which contains the code.",
      "required": true
    }
  }