feat(ruby): switch api key helper

Author: Fluf22

clients/algoliasearch-client-ruby/lib/algolia/api_client.rb

@@ -20,6 +20,10 @@ def self.default
       @@default ||= ApiClient.new
     end
 
+    def set_api_key(api_key)
+      @config.set_api_key(api_key)
+    end
+
     # Call an API with given options.
     #
     # @return [Http::Response] the response.

clients/algoliasearch-client-ruby/lib/algolia/configuration.rb

@@ -44,6 +44,11 @@ def initialize(app_id, api_key, hosts, client_name, opts = {})
       yield(self) if block_given?
     end
 
+    def set_api_key(api_key)
+      @api_key = api_key
+      @header_params["X-Algolia-API-Key"] = api_key
+    end
+
     # The default Configuration object.
     def self.default
       @@default ||= Configuration.new

templates/ruby/api.mustache

@@ -58,6 +58,14 @@ module {{moduleName}}
     def self.create_with_config(config)
       new(config)
     end
+    
+    # Helper method to switch the API key used to authenticate the requests.
+    #
+    # @param api_key [String] the new API key to use.
+    # @return [void]
+    def self.set_api_key(api_key)
+      @api_client.set_api_key(api_key)
+    end
 
 {{#operation}}
     {{#notes}}