use https for iptables download
@@ -23,7 +23,7 @@ RUN apt-get update && \
# pre-build `iptables`
RUN apt-get update && \
apt-get -y install bzip2 && \
- cd /tmp && curl http://www.netfilter.org/projects/iptables/files/iptables-1.4.21.tar.bz2 | tar jxf - && \
+ cd /tmp && curl https://www.netfilter.org/projects/iptables/files/iptables-1.4.21.tar.bz2 | tar jxf - && \
cd iptables-1.4.21 && \
mkdir /opt/static-assets/iptables && \
./configure --prefix=/opt/static-assets/iptables --enable-static --disable-shared && \
