Since GitLab CI is enabled by default, remove enabling it by pushing .gitlab-ci.yml

CHANGELOG

@@ -15,6 +15,7 @@ v 8.2.0
   - Add allow_failure field to commit status API (Stan Hu)
   - Commits without .gitlab-ci.yml are marked as skipped
   - Save detailed error when YAML syntax is invalid
+  - Since GitLab CI is enabled by default, remove enabling it by pushing .gitlab-ci.yml
   - Added build artifacts
   - Improved performance of replacing references in comments
   - Show last project commit to default branch on project home page

app/services/git_push_service.rb

@@ -58,12 +58,6 @@ class GitPushService
     @push_data = build_push_data(oldrev, newrev, ref)
-    # If CI was disabled but .gitlab-ci.yml file was pushed
-    # we enable CI automatically
-    if !project.builds_enabled? && gitlab_ci_yaml?(newrev)
-      project.enable_ci
-    end
-
     EventCreateService.new.push(project, user, @push_data)
     project.execute_hooks(@push_data.dup, :push_hooks)
     project.execute_services(@push_data.dup, :push_hooks)
@@ -134,10 +128,4 @@ class GitPushService
   def commit_user(commit)
     commit.author || user
   end
-
-  def gitlab_ci_yaml?(sha)
-    @project.repository.blob_at(sha, '.gitlab-ci.yml')
-  rescue Rugged::ReferenceError
-    nil
-  end
 end