added gitlab repo to helm

Dockerfile

@@ -13,6 +13,8 @@ COPY scripts /scripts
 WORKDIR /scripts
 
 CMD php deleteOldBranches.php && \
+    helm repo add gitlab https://charts.gitlab.io/ && \
+    helm repo update && \
     export GITLAB_VERSION=$(helm ls -o json | jq -c -r '.[] | select(.name == "gitlab") | .chart' | cut -d"-" -f2) && \
     helm get values gitlab > gitlab.yml && \
     helm upgrade gitlab gitlab/gitlab -f gitlab.yml --version=$GITLAB_VERSION --set registry.maintenance.readOnly.enabled=true --wait && \