This no longer pulls in systemd/worker, saving space and makes it
suitable for use in a UBI container, where qemu-img is not available.
This drops support for --inbuilt-worker from entrypoint.py. The script
could be simplified further in a future commit, or folded into the
main binary.
Add a Dockerfile that creates a container based on Fedora with
osbuild-composer deployed. Create a suitable entrypoint that runs
osbuild-composer in the container and creates the required sockets
without systemd.
To test this, build the container via:
docker build ./containers/osbuild-composer
Then create your certificates in /etc/osbuild-composer/. Then run
composer with something like:
docker run --rm -v /etc/osbuild-composer:/etc/osbuild-composer <id>
(Where <id> is the container ID returned by `docker build`.)
