Updating to official COmanage 3.1.0 release

Dockerfile

@@ -20,7 +20,7 @@ ARG registry=docker.io
 ARG maintainer=tier
 ARG imagename=comanage
 ARG version=3.1.0
-ARG tierversion=17040
+ARG tierversion=18020
 
 MAINTAINER $maintainer
 LABEL Vendor="Internet2"
@@ -75,7 +75,7 @@ ENV COMANAGE_PREFIX=comanage-registry
 
 # Note using git to grab this alternate develop branch
 RUN mkdir -p /opt/comanage && cd /opt/comanage && \
-      git clone -b develop https://github.com/Internet2/comanage-registry.git && \
+      wget -q $COMANAGE_URL && \ && \
       mv comanage-registry $COMANAGE_PREFIX-$VERSION && \
       ln -s /opt/comanage/$COMANAGE_PREFIX-$VERSION  /opt/comanage/current && \
       mkdir /var/cache/registry && \