Provide Docker Container

I would like to deploy httpjail in server mode as a docker container. I did some tests, first with a two stage build (where I failed, but I guess this is due to my lack of knowledge about Rust) and then with a Dockerfile, where I just download the release binary from github.com (this worked).

I would appreciate, if a sane Dockerfile would be shipped with this project or even better, if a Docker container would be made available from some OCI registry.

Some things to be considered:

* In order to make httpjail work for https, either the certificate and the key needs to be provided to the docker container at runtime or there needs to be a volume or bind-mount, where the automatically generated certificate can be taken from for use with the clients.
* Similarly, the js-file, shell-script or the line-processor needs to be passed to httpjail, e.g. through volume or bind-mount.
* I used `debian:13-slim`, but it might be possible to use an even smaller image.
* Make it multi arch, I am in particular interested in amd64 and arm64.