Just download Raspberry Pi OS Lite 32Bit
https://www.raspberrypi.org/software/operating-systems/#raspberry-pi-os-32-bit
Download & Install etcher for OS Flash
https://www.balena.io/etcher/
https://github.com/RaspAP/raspap-webgui
sudo vim /etc/sysctl.conf
script-security 2
up /etc/openvpn/update-resolv-conf
down /etc/openvpn/update-resolv-conf
export CLIENTNAME="rasp"
docker-compose run --rm openvpn easyrsa build-client-full $CLIENTNAME nopass
docker-compose run --rm openvpn ovpn_getclient $CLIENTNAME > $CLIENTNAME.ovpn