cel-expr-python: add build-cel-expr-python.yml for riscv64 wheels

[luhenry]

• Package: cel-expr-python
• Version: 0.1.3
• Source: https://github.com/cel-expr/cel-python
• Docs: https://github.com/cel-expr/cel-python

Seven pybind11 extensions over cel-cpp, protobuf and abseil, built with Bazel. Upstream publishes no riscv64 wheel.

Mirrors upstream's release_linux.sh and its release/pyproject.toml cibuildwheel config.

Differs from upstream

• Bazel 8.5.1 bootstrapped from the dist archive - no riscv64 bazelisk binary exists.
• Build container driven directly instead of cibuildwheel, like the other Bazel ports.
• Local JDK for Bazel's Java runtimes - no remote JDK for riscv64 (cel-cpp runs ANTLR).
• Bazel's convenience symlinks cleared before packaging - upstream wheels carry a stray bazel-project/ tree.

Matrix: cp312/cp313/cp314 - upstream ships no free-threaded wheel.

Testing

• same as upstream (cel_basic_test.py), plus an import of all seven extensions.

License: Wheel statically links cel-cpp, abseil, protobuf, re2, pybind11 and other permissive (Apache-2.0/BSD/MIT) dependencies; upstream ships no licence text for them, so the build adds it.

[github-actions]

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