diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 821c5966f..31dd9a050 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -38,12 +38,7 @@ pre:github:
   tags:
     - deploy
   script:
-    - git checkout $CI_BUILD_REF_NAME
-    - git pull --rebase origin $CI_BUILD_REF_NAME
-    - git filter-branch --force --index-filter --prune-empty --tag-name-filter cat -- $CI_BUILD_REF_NAME
-    - if git remote | grep github > /dev/null; then git remote rm github; fi
-    - git remote add github git@github.com:martini/zammad-test.git
-    - git push github $CI_BUILD_REF_NAME
+    - script/build/sync_repo.sh git@github.com:martini/zammad.git
 
 test:unit:mysql:
   stage: test
diff --git a/script/build/sync_repo.sh b/script/build/sync_repo.sh
new file mode 100755
index 000000000..273458f10
--- /dev/null
+++ b/script/build/sync_repo.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -ex
+
+GITHUB_DEST=$1
+
+if echo $CI_BUILD_REF_NAME | grep private; then
+  echo 'sync no private branches'
+  exit 0
+fi
+
+git checkout $CI_BUILD_REF_NAME
+git pull --rebase origin $CI_BUILD_REF_NAME
+if git remote | grep github > /dev/null; then git remote rm github; fi
+git remote add github $GITHUB_DEST
+git push github $CI_BUILD_REF_NAME