`file` shoud be an accepted primitive data type in swagger 2.0 spec

[thejan2009]

Describe the bug See https://swagger.io/specification/v2/#specification, Section Data types.

An additional primitive data type "file" is used by the Parameter Object and the Response Object to set the parameter type or the response as being a file.

It seems this file data type exception is not accounted for Response object.

To Reproduce Steps to reproduce the behavior: openapi lint --format stylish spec.yml

Expected behavior No spec error should be raised.

Logs

spec.yml:
  28:19  error    spec                    `type` can be one of the following only: "object", "array", "string", "number", "integer", "boolean", "null".
  3:1    warning  info-license            Info object should contain `license` field.
  20:5   warning  operation-operationId   Operation object should contain `operationId` field.
  24:7   warning  operation-4xx-response  Operation must have at least one `4xx` response.

OpenAPI definition

swagger: "2.0"

info:
  title: API
  version: 0.0.1
  description: |
    API

host: swagger.petstore
schemes:
  - https
basePath: /api/v1
consumes:
  - application/json
produces:
  - application/json; charset=utf-8

paths:
  /foo:
    get:
      summary: foo
      produces:
        - application/octet-stream
      responses:
        200:
          description: txt file
          schema:
            type: file

openapi-cli Version(s) redocly/openapi-cli:v1.0.0-beta.80 container

Node.js Version(s) See above.

[amakhrov]

this is basically a blocker for using it with our OAS 2.0 spec

[RomanHotsiy]

I raised priority. Thanks.