Docker for Mac M1 Preview VPN workaround

docker_setup_vpn.sh

docker_setup_vpn () {
        echo "## Previous Configuration"
        sudo pfctl -a com.apple.internet-sharing/shared_v4 -s nat 2> /dev/null | tee /tmp/docker_vpn.conf
        if sudo pfctl -a com.apple.internet-sharing/shared_v4 -s nat 2> /dev/null | grep 192.168.64.0 | grep -q utun2
        then
                echo && echo "Not applying change"
        else
                echo "nat on utun2 inet from 192.168.64.0/24 to any -> (utun2) extfilter ei" >> /tmp/docker_vpn.conf
                sudo pfctl -a com.apple.internet-sharing/shared_v4 -N -f /tmp/docker_vpn.conf 2> /dev/null
                echo && echo "## New Configuration"
                cat /tmp/docker_vpn.conf
        fi
}