How to pre-install some pakage in sdbuild workflow

Support
1

I want to install a pakage in sdbuild workflow

like this:apt-get install -y bc

what i do now:

1.creat a file in PYNQ repository/boards/zynq-7020/packages/bc/qemu.sh

2.write code in it

set -e
set -x
echo “>>> Installing bc inside QEMU emulated rootfs”
apt-get update
apt-get install -y bc

Is this the correct method? thanks.