enroll_project_in_credentials_diffing

# File railties/lib/rails/commands/credentials/credentials_command/diffing.rb, line 9
  def enroll_project_in_credentials_diffing
    if enrolled_in_credentials_diffing?
      say "Project is already enrolled in credentials file diffing."
    else
      gitattributes.write(GITATTRIBUTES_ENTRY, mode: "a")

      say "Enrolled project in credentials file diffing!"
      say "Rails ensures the rails_credentials diff driver is set when running `credentials:edit`. See `credentials:help` for more."
    end
  end