This PR sets up a Nix flake build and associated CI workflows for the WASM semantics that will allow us to do similar for the MX- projects, and to get KWASM from kup. It is a revised version of #604 that accommodates @tothtamas28's recent changes to the Python packaging of the semantics; broadly speaking the changes are very similar and largely relate to different paths and environment variables being necessary for the Python-packaged version.
This PR sets up a Nix flake build and associated CI workflows for the WASM semantics that will allow us to do similar for the MX- projects, and to get KWASM from
kup. It is a revised version of #604 that accommodates @tothtamas28's recent changes to the Python packaging of the semantics; broadly speaking the changes are very similar and largely relate to different paths and environment variables being necessary for the Python-packaged version.