Use a forked registry that includes an updated version of aws-sdk-go

This should fix issues with pushing to registries backed by s3 storage

.custom_sources.yml

@@ -23,8 +23,8 @@ omnibus:
   remote: "https://dev.gitlab.org/gitlab/omnibus.git"
   alternative: "https://gitlab.com/gitlab-org/omnibus.git"
 registry:
-  remote: "git@dev.gitlab.org:omnibus-mirror/distribution.git"
-  alternative: "https://gitlab.com/omnibus-mirror/distribution.git"
+  remote: "git@gitlab.com:twk3/docker-distribution.git"
+  alternative: "https://gitlab.com/twk3/docker-distribution.git"
 rb-readline:
   remote: "git@dev.gitlab.org:omnibus-mirror/rb-readline.git"
   alternative: "https://gitlab.com/omnibus-mirror/rb-readline.git"

config/software/registry.rb

@@ -19,12 +19,12 @@
 require "#{Omnibus::Config.project_root}/lib/gitlab/version"
 name 'registry'
-version = Gitlab::Version.new('registry', '2.6.1')
+version = Gitlab::Version.new('registry', 'dd544a82d93e8d39cec3d3d45117c3f486365589')
 default_version version.print
 license 'Apache-2.0'
-license_file "https://raw.githubusercontent.com/docker/distribution/#{version.print}/LICENSE"
+license_file "https://gitlab.com/twk3/docker-distribution/raw/#{version.print}/LICENSE"
 source git: version.remote