They do support building in a Docker environment, but I found the documentation lacking and I saw myself asking in the forums.
It is easier to set up Docker than virtualization, plus the containers spawn so much faster so we can better iterate and make modifications in the build.
I will just reflect here the commands to produce a fully automated build for an Odroid XU4, headless Debian Stretch image
git clone https://github.com/armbian/build armbian-build
./compile.sh docker BOARD=odroidxu4 BRANCH=next KERNEL_ONLY=no KERNEL_CONFIGURE=no RELEASE=stretch BUILD_DESKTOP=no
All the build options are here. I personally add these ones
- CLEAN_LEVEL="" to avoid recompiling the kernel, u-boot and the rest every build, unless they have changed.
- NO_APT_CACHER=no to use apt-cacher-ng for faster builds.