fix distinct download URL for weekly vs stable
diff --git a/1.570/Dockerfile b/1.570/Dockerfile
index 9200a7f..cc5a6c9 100644
--- a/1.570/Dockerfile
+++ b/1.570/Dockerfile
@@ -25,7 +25,7 @@
# could use ADD but this one does not check Last-Modified header
# see https://github.com/docker/docker/issues/8331
-RUN curl -L http://mirrors.jenkins-ci.org/war-stable/$JENKINS_VERSION/jenkins.war -o /usr/share/jenkins/jenkins.war
+RUN curl -L http://mirrors.jenkins-ci.org/war/1.570/jenkins.war -o /usr/share/jenkins/jenkins.war
ENV JENKINS_UC https://updates.jenkins-ci.org
RUN chown -R jenkins "$JENKINS_HOME" /usr/share/jenkins/ref