Promote container registry test to pre-prod

qa/qa/specs/features/browser_ui/5_package/container_registry_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Package', :orchestrated do
-    describe 'Container Registry', only: { subdomain: :staging } do
+  RSpec.describe 'Package' do
+    describe 'Container Registry', only: { subdomain: %i[staging pre] } do
       let(:project) do
         Resource::Project.fabricate_via_api! do |project|
           project.name = 'project-with-registry'
@@ -26,6 +26,10 @@ module QA
               - docker:19.03.12-dind
             variables:
               IMAGE_TAG: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+              DOCKER_HOST: tcp://docker:2376
+              DOCKER_TLS_CERTDIR: "/certs"
+              DOCKER_TLS_VERIFY: 1
+              DOCKER_CERT_PATH: "$DOCKER_TLS_CERTDIR/client"
             script:
               - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
               - docker build -t $IMAGE_TAG .