After successful build, the build container is by default removed. This may be undesired when making incremental changes to a customized build. To prevent the build script from remove the container add
```bash
PRESERVE_CONTAINER=1 ./build-docker.sh
```
There is a possibility that even when running from a docker container, the
installation of `qemu-user-static` will silently fail when building the image
because `binfmt-support`_must be enabled on the underlying kernel_. An easy