Moved down REPO_URL to enable caching

Dockerfile

@@ -1,8 +1,6 @@
 FROM ubuntu:14.04
 MAINTAINER Ascensio System SIA <support@onlyoffice.com>
 
-ARG REPO_URL="deb http://static.teamlab.com/repo/debian/ squeeze main"
-
 ENV LANG=en_US.UTF-8 LANGUAGE=en_US:en LC_ALL=en_US.UTF-8 DEBIAN_FRONTEND=noninteractive
 
 RUN echo "#!/bin/sh\nexit 0" > /usr/sbin/policy-rc.d && \
@@ -36,6 +34,8 @@ ADD run-document-server.sh /app/onlyoffice/run-document-server.sh
 
 EXPOSE 80 443
 
+ARG REPO_URL="deb http://static.teamlab.com/repo/debian/ squeeze main"
+
 RUN echo "$REPO_URL" | tee /etc/apt/sources.list.d/onlyoffice.list && \
     apt-get -y update && \
     service postgresql start && \