The Docker image is broken with the error message:
scryer-prolog: error while loading shared libraries:
libssl.so.1.1: cannot open shared object file: No such
file or directory
We use the base base image `debian:stable-slim` and in the
background a new Debian version was marked stable (bookworm),
which has libssl3 instead of libssl1.1 installed.
I downgraded the base image to the previous stable version
(bullseye), which seems to fix the issue.
With the previous Rust version 1.61, the build fails with
> error[E0658]: use of unstable library feature 'scoped_threads'
This has been "stabilized" in Rust 1.63. To avoid the hassle
of manually updating the version, we can just default to the
latest minor release.
