jenkins: www: Ignore chmod failures

Change-Id: I249e55f9a4b627fc62ecdfdf2b5f9e558a2f756b
diff --git a/jenkins/www/leaf-www.groovy b/jenkins/www/leaf-www.groovy
index f7c3f4e..94f1946 100644
--- a/jenkins/www/leaf-www.groovy
+++ b/jenkins/www/leaf-www.groovy
@@ -20,7 +20,7 @@
                         ssh jenkins@$MASTER_IP git -C /var/www/leafos.org/ reset --hard
                         ssh jenkins@$MASTER_IP git -C /var/www/leafos.org/ pull ${GERRIT_URL} ${GERRIT_REFSPEC}
                         ssh jenkins@$MASTER_IP "cd /var/www/leafos.org; composer install"
-                        ssh jenkins@$MASTER_IP chmod -R a+rwx /var/www/leafos.org/var/cache/
+                        ssh jenkins@$MASTER_IP chmod -R a+rwx /var/www/leafos.org/var/cache/ || true
                 '''
             }
         }