OPNsense images for aarch64

These experimental images are NOT official releases. It’s a proof of concept that OPNsense is workable for aarch64. Use at your own risks. Read this issue before the first reboot. The OPNsense-${VER}-OpenSSL-vm-aarch64.vmdk image works for ESXi and QEMU. The OPNsense-${VER}-OpenSSL-arm-aarch64-RPI3.img image works for RPI3b and RPI3b+ (RPI4 is tested not working yet bootable with a dirty image now). 1 Introduction The OPNsense 21.1 images and 21.7 images for aarch64 are built on FreeBSD 12 aarch64 using the tools1.