Обновить 'Dockerfile'

Dockerfile

@@ -17,7 +17,8 @@ RUN set -x \
 #           && yum install -y https://centos6.iuscommunity.org/ius-release.rpm \
            && yum install -y https://centos7.iuscommunity.org/ius-release.rpm \
            && yum install -y git2u \
-           && yum clean all
+           && yum clean all \
+           && rm -rf /var/cache/yum
 
 COPY app.py /usr/lib/python2.7/site-packages/StoneVPN/app.py