Add docker command to build container

build/Dockerfile

@@ -86,5 +86,8 @@ RUN curl -sSL http://www.tcpdump.org/release/libpcap-${LIBPCAP_CROSS_VERSION}.ta
 		&& ln -sf libpcap.so.${MAJOR_VER} /usr/local/lib/libpcap.so \
 		&& make clean; done
 
+# Install Docker
+RUN curl -fsSL get.docker.com | VERSION=18.06.0-ce /bin/sh
+
 COPY build.sh /
 ENTRYPOINT ["sh", "/build.sh"]