This patch provides an initial version of a working fdroid-CLI that runs
in a container. The container itself is built on demand from debian and
fixes some execution errors by patching `apksigner`.

This is used instead of the upstream package, since it includes the
android SDK by itself instead of expecting it being installed on the
host. However, it's far from perfect and the build job might hangs, even
though it was successfully commited to the podman repository.

It's left up to fruther investigation, why this happens. Meanwhile
restarting the CLI once the image is built, should fix it.