Allow multiple '-' in container repository names

Update the container_repository_name_regex to align
more with the regex used by docker for more
consistent naming restrictions.

changelogs/unreleased/36611-gitlab-container-registry-repository-names-regex-is-not-at-parity-w.yml

+---
+title: Update Container Registry naming restrictions to allow for sequential '-'
+merge_request: 20318
+author:
+type: fixed

lib/gitlab/regex.rb

@@ -19,7 +19,7 @@ module Gitlab
     # See https://github.com/docker/distribution/blob/master/reference/regexp.go.
     #
     def container_repository_name_regex
-      @container_repository_regex ||= %r{\A[a-z0-9]+((?:[._/]|__|[-])[a-z0-9]+)*\Z}
+      @container_repository_regex ||= %r{\A[a-z0-9]+((?:[._/]|__|[-]{0,10})[a-z0-9]+)*\Z}
     end
 
     ##

spec/lib/gitlab/regex_spec.rb

@@ -61,6 +61,12 @@ describe Gitlab::Regex do
     it { is_expected.to match('my/image') }
     it { is_expected.to match('my/awesome/image-1') }
     it { is_expected.to match('my/awesome/image.test') }
+    it { is_expected.to match('my/awesome/image--test') }
+    # docker distribution allows for infinite `-`
+    # https://github.com/docker/distribution/blob/master/reference/regexp.go#L13
+    # but we have a range of 0,10 to add a reasonable limit.
+    it { is_expected.not_to match('my/image-----------test') }
+    it { is_expected.not_to match('my/image-.test') }
     it { is_expected.not_to match('.my/image') }
     it { is_expected.not_to match('my/image.') }
   end