Add buddybuild documentation.

CHANGELOG.md

@@ -3,6 +3,7 @@
 * Add your own contribution below
 * Fix find inline comment position at the last line of diff - leonhartX
 * Add inline comments to changed lines only when `dismiss_out_of_range_message` is enabled - leonhartX
+* Add documentation for [buddybuild](https://www.buddybuild.com) - sunshinejr
 
 ## 4.3.0
 

lib/danger/ci_source/buddybuild.rb

@@ -0,0 +1,35 @@
+module Danger
+  # ### CI Setup
+  #
+  # Buddybuild has an integration for Danger already built-in.
+  # What you need to do is to upload your `Gemfile` and `Dangerfile` to
+  # the server and you should be all set-up. However, if you want to use
+  # different bot for Danger, you can do it with token setup described below.
+  #
+  # ### Token Setup
+  #
+  # Login to buddybuild and select your app. Go to your *App Settings* and
+  # in the *Build Settings* menu on the left, choose *Environment Variables*.
+  #
+  # #### GitHub
+  # Add the `DANGER_GITHUB_API_TOKEN` to your build user's ENV.
+  #
+  # #### GitLab
+  # Add the `DANGER_GITLAB_API_TOKEN` to your build user's ENV.
+
+  class Buddybuild < CI
+    def self.validates_as_ci?(_)
+      false
+    end
+
+    def self.validates_as_pr?(_)
+      false
+    end
+
+    def initialize(_) end
+
+    def supported_request_sources
+      @supported_request_sources ||= []
+    end
+  end
+end

spec/lib/danger/ci_sources/ci_source_spec.rb

@@ -7,6 +7,7 @@
         [
           "Danger::LocalGitRepo",
           "Danger::Bitrise",
+          "Danger::Buddybuild",
           "Danger::Buildkite",
           "Danger::CircleCI",
           "Danger::Drone",