[Ruby][Faraday] Various improvements (#3520)

* update ruby faraday oas v2 samples

* skip some default tests in faraday

* add ruby faraday oas v3 client

* add tests, fix url

* add tests to CI

* fix file upload

* undo changes to ruby-client-petstore.sh

* test faraday first

* combine gemspec tempaltes

* test ruby faraday in drone.io

* use smaller image

* update bundler

* use official ruby image

* skip bundler installation

* skip autotest

* install make

* use different image

* skip ruby tests in drone.io

samples/client/petstore/ruby-faraday/docs/AnotherFakeApi.md

@@ -7,24 +7,27 @@ Method | HTTP request | Description
 [**call_123_test_special_tags**](AnotherFakeApi.md#call_123_test_special_tags) | **PATCH** /another-fake/dummy | To test special tags
 
 
-# **call_123_test_special_tags**
-> Client call_123_test_special_tags(client)
+
+## call_123_test_special_tags
+
+> Client call_123_test_special_tags(body)
 
 To test special tags
 
 To test special tags and operation ID starting with number
 
 ### Example
+
 ```ruby
 # load the gem
 require 'petstore'
 
 api_instance = Petstore::AnotherFakeApi.new
-client = Petstore::Client.new # Client | client model
+body = Petstore::Client.new # Client | client model
 
 begin
   #To test special tags
-  result = api_instance.call_123_test_special_tags(client)
+  result = api_instance.call_123_test_special_tags(body)
   p result
 rescue Petstore::ApiError => e
   puts "Exception when calling AnotherFakeApi->call_123_test_special_tags: #{e}"
@@ -33,9 +36,10 @@ end
 
 ### Parameters
 
+
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
- **client** | [**Client**](Client.md)| client model | 
+ **body** | [**Client**](Client.md)| client model | 
 
 ### Return type
 
@@ -47,8 +51,6 @@ No authorization required
 
 ### HTTP request headers
 
- - **Content-Type**: application/json
- - **Accept**: application/json
-
-
+- **Content-Type**: application/json
+- **Accept**: application/json