Add a Build Variable to represent the triggering GitLab user's name

* Predefined variable represents the name of the GitLab user that started a build

app/models/ci/build.rb

@@ -384,7 +384,8 @@ module Ci
       [
         { key: 'GITLAB_USER_ID', value: user.id.to_s, public: true },
-        { key: 'GITLAB_USER_EMAIL', value: user.email, public: true }
+        { key: 'GITLAB_USER_EMAIL', value: user.email, public: true },
+        { key: 'GITLAB_USER_NAME', value: user.name, public: true }
       ]
     end

doc/ci/variables/README.md

@@ -77,6 +77,12 @@ future GitLab releases.**
 | **GITLAB_CI**                   | all    | all    | Mark that job is executed in GitLab CI environment |
 | **GITLAB_USER_ID**              | 8.12   | all    | The id of the user who started the job |
 | **GITLAB_USER_EMAIL**           | 8.12   | all    | The email of the user who started the job |
+<<<<<<< HEAD
+| **GITLAB_USER_NAME**            | 10.0   | all    | The name of the user who started the job |
+=======
+| **GITLAB_USER_USERNAME**        | 10.0   | all    | The username of the user who started the job |
+| **GITLAB_USER_NAME**            | 10.0   | all    | The real name of the user who started the job |
+>>>>>>> 940c584882... fixup name
 | **RESTORE_CACHE_ATTEMPTS**      | 8.15   | 1.9    | Number of attempts to restore the cache running a job |
 ## 9.0 Renaming

spec/models/ci/build_spec.rb

@@ -1247,8 +1247,11 @@ describe Ci::Build do
     context 'when build has user' do
       let(:user_variables) do
-        [{ key: 'GITLAB_USER_ID',    value: user.id.to_s, public: true },
-         { key: 'GITLAB_USER_EMAIL', value: user.email,   public: true }]
+        [
+          { key: 'GITLAB_USER_ID', value: user.id.to_s, public: true },
+          { key: 'GITLAB_USER_EMAIL', value: user.email, public: true },
+          { key: 'GITLAB_USER_NAME', value: user.name, public: true }
+        ]
       end
       before do