feat: add Docker + Compose manifests

[bartsanchez]

No description provided.

[bartsanchez]

Now I think this is not the way to go. I'd say the proper way is that the Docker image should work without mounting any volume. The problem I faced is that the zxbc command does not write the output to STDOUT, but write it to a file. I'll open an issue to requesting support for this feature.

[boriel]

That's not the only problem:
When the user launches the executable (usually from a 3rd party IDE, e.g. look at ZXBasicStudio, in this same organization), the user's local folder must be mounted in order to read the .BAS file and, optionally any other #included file
This included file can be in any other folder in the user's local drive, and obviously mounting this or giving R/O access to docker is complicated.

Also, I've planned to put extra libraries out, in a local folder (i.e. .local/boriel-basic/... in Linux) so the compiler can install 3rd party libraries as JavaScript and Python do.