Make yarn.lock writable

debian/gitlab.postinst

@@ -118,7 +118,7 @@ case "$1" in
 
     # nginx/httpd should be able to connect to gitlab-workhorse.socket and serve public
     chown ${gitlab_user}:${nginx_user} ${gitlab_uploads_path}/../* ${gitlab_pid_path}
-    
+
     # Customize permissions
     echo "Updating file permissions..."
     chmod ug+rwX,o-rwx,u-s,g+s ${gitlab_repo_path}/
@@ -126,6 +126,9 @@ case "$1" in
       chown ${gitlab_user}: $i
     done
 
+    # Make yarn.lock writable
+    chown ${gitlab_user}: /var/lib/gitlab/yarn.lock
+
     runuser -u ${gitlab_user} -- sh -c "chmod 700 ${gitlab_uploads_path}"
     runuser -u ${gitlab_user} -- sh -c 'git config --global core.autocrlf "input"'