Remove forgotten Procfile

Removes Procfile from this repository.

Now we make use of Runit on development through
GDK, which uses its own Procfile to specify processes.

Apparently this file was forgotten and is not used anymore.

Procfile

-# For DEVELOPMENT only. Production uses Runit in
-# https://gitlab.com/gitlab-org/omnibus-gitlab or the init scripts in
-# lib/support/init.d, which call scripts in bin/ .
-#
-web: RAILS_ENV=development bin/web start_foreground
-worker: RAILS_ENV=development bin/background_jobs start_foreground

lib/gitlab/danger/helper.rb

@@ -144,7 +144,7 @@ module Gitlab
         %r{\A(ee/)?spec/(?!javascripts|frontend)[^/]+} => :backend,
         %r{\A(ee/)?vendor/(?!assets)[^/]+} => :backend,
         %r{\A(ee/)?vendor/(languages\.yml|licenses\.csv)\z} => :backend,
-        %r{\A(Gemfile|Gemfile.lock|Procfile|Rakefile)\z} => :backend,
+        %r{\A(Gemfile|Gemfile.lock|Rakefile)\z} => :backend,
         %r{\A[A-Z_]+_VERSION\z} => :backend,
         %r{\A\.rubocop(_todo)?\.yml\z} => :backend,
 

spec/lib/gitlab/danger/helper_spec.rb

@@ -206,7 +206,6 @@ describe Gitlab::Danger::Helper do
 
       'Gemfile'        | :backend
       'Gemfile.lock'   | :backend
-      'Procfile'       | :backend
       'Rakefile'       | :backend
       'FOO_VERSION'    | :backend