rkt container not running on raspberrypi 3

[Shaiful082]

Environment

Replace this with the output of:

root@raspberrypi:~# printf "$(rkt version)\n--\n$(uname -srm)\n--\n$(cat /etc/os-release)\n--\n$(systemctl --version)\n"
rkt Version: 1.21.0
appc Version: 0.8.9
Go Version: go1.7.4
Go OS/Arch: linux/arm
Features: -TPM +SDJOURNAL

Linux 4.14.79-v7+ armv7l

PRETTY_NAME="Raspbian GNU/Linux 9 (stretch)"
NAME="Raspbian GNU/Linux"
VERSION_ID="9"
VERSION="9 (stretch)"
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

systemd 232
+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD +IDN`

What did you do?
Trying to run ubuntu container on raspberrypi 2/3 using this command :
rkt run --interactive --insecure-options=image --dir=/var/lib/rkt --net=host --dns=$(awk '/nameserver/ {print $2}' < /etc/resolv.conf) registry-1.docker.io/library/ubuntu:latest

What did you expect to see?
Just want to run rkt container on raspberry pi 3 on arm
What did you see instead?
run: bad arch "arm" for linux (must be one of: [amd64 i386 aarch64 aarch64_be armv6l armv7l armv7b ppc64le])