chompjs: add build-chompjs.yml for riscv64 wheels - #1344

• Package: chompjs
• Version: 1.4.1
• Source: https://github.com/Nykakin/chompjs
• Docs: https://github.com/Nykakin/chompjs

Compiles a small CPython C extension (_chompjs) that parses malformed/JS-style JSON into Python dicts. Upstream publishes no riscv64 wheel.

Mirrors upstream's compile.yml cibuildwheel invocation, narrowed to riscv64.

Differs from upstream

• Builds from a pinned commit, not a tag - upstream cuts releases without git tags; the commit's tree is byte-identical to the released 1.4.1 sdist.
• The orjson-backed doctest only runs on cp312/cp313/cp314 manylinux - our registry has no riscv64 orjson wheel for cp314t or musllinux yet.

Testing

• unittest suite runs on every interpreter/libc combination.
• doctest module (needs orjson) narrowed per above.

License: OK - MIT, nothing vendored.