add step to push master to gitea

Jenkinsfile

@@ -111,7 +111,7 @@ pipeline {
                     git pull origin master
                     git remote add master https://gitea.confdroid.com/confdroid/puppet_cd.git
                     git -c credential.helper="!f() { echo username=${GITEA_USER}; echo password=${GITEA_TOKEN}; }; f" \
-                    push origin HEAD:master
+                    push master --mirror
                   '''
               }
             }