diff --git a/lib/gitlab/qa/release.rb b/lib/gitlab/qa/release.rb
index 027dbf103083da81fda8e73a53bea6c3366d11c1..05489b32b25f33db3062fc88a8768000ec15c0dd 100644
--- a/lib/gitlab/qa/release.rb
+++ b/lib/gitlab/qa/release.rb
@@ -59,6 +59,9 @@ module Gitlab
       DEFAULT_CANONICAL_TAG = 'nightly'
       DEV_REGISTRY = Gitlab::QA::Runtime::Env.qa_dev_registry
       COM_REGISTRY = Gitlab::QA::Runtime::Env.qa_com_registry
+      CUSTOM_REGISTRY = Gitlab::QA::Runtime::Env.qa_custom_registry
+
+      # CUSTOM_OMNIBUS_MIRROR_REGISTRY_REGEX = %r{\A#{Regexp.escape(CUSTOM_REGISTRY)}/.*omnibus-gitlab-mirror\z} if CUSTOM_REGISTRY
 
       InvalidImageNameError = Class.new(RuntimeError)
 
@@ -162,6 +165,12 @@ module Gitlab
                    }
                  elsif omnibus_mirror? || omnibus_security?
                    omnibus_login_params
+                 elsif omnibus_mirror_fork?
+                   {
+                     username: Runtime::Env.gitlab_custom_username,
+                     password: Runtime::Env.gitlab_custom_username_token,
+                     registry: CUSTOM_REGISTRY
+                   }
                  end
 
         populate_registry_env_vars(params)
@@ -203,6 +212,10 @@ module Gitlab
         image.start_with?("#{COM_REGISTRY}/gitlab-org/build/omnibus-gitlab-mirror/")
       end
 
+      def omnibus_mirror_fork?
+        image.start_with?(%r{\A#{Regexp.escape(CUSTOM_REGISTRY)}/.*omnibus-gitlab-mirror\z}o)
+      end
+
       def omnibus_security?
         image.start_with?("#{COM_REGISTRY}/gitlab-org/security/omnibus-gitlab/")
       end
diff --git a/lib/gitlab/qa/runtime/env.rb b/lib/gitlab/qa/runtime/env.rb
index 0bcaed008036de5cd59bf6a55016ea3fc099a972..30d539ed696638784c2b4fb7c53f4185de65a396 100644
--- a/lib/gitlab/qa/runtime/env.rb
+++ b/lib/gitlab/qa/runtime/env.rb
@@ -219,6 +219,14 @@ module Gitlab
           env_var_value_if_defined('GITLAB_DEV_USERNAME') || 'gitlab-qa-bot'
         end
 
+        def gitlab_custom_username
+          env_var_value_if_defined('GITLAB_CUSTOM_USERNAME')
+        end
+
+        def gitlab_custom_username_token
+          env_var_value_if_defined('GITLAB_CUSTOM_ACCESS_TOKEN')
+        end
+
         def run_id
           @run_id ||= "gitlab-qa-run-#{Time.now.strftime('%Y-%m-%d-%H-%M-%S')}-#{SecureRandom.hex(4)}"
         end
@@ -432,6 +440,10 @@ module Gitlab
           env_var_value_if_defined('QA_COM_REGISTRY') || 'registry.gitlab.com'
         end
 
+        def qa_custom_registry
+          env_var_value_if_defined('QA_CUSTOM_REGISTRY')
+        end
+
         def gitlab_license_mode
           env_var_value_if_defined('GITLAB_LICENSE_MODE')
         end