pinecone: add build-pinecone.yml for riscv64 wheels

[luhenry]

• Package: pinecone
• Version: 9.1.0
• Source: https://github.com/pinecone-io/python-sdk
• Docs: https://docs.pinecone.io

Compiles pinecone's PyO3/tonic gRPC extension (pinecone._grpc) into a wheel. Upstream publishes no riscv64 wheel.

Mirrors the build job of upstream's release-rc.yaml.

Differs from upstream

• protoc installed via CRB's dnf packages, not a pinned release download - upstream's arch case has no riscv64 branch

Matrix: single cp310-abi3 target - pyo3's abi3-py310 feature is unconditional, so one wheel covers every cp310+ interpreter.

Testing

• ipython added - imported directly by the display-repr tests, not in upstream's dependency-groups
• 2 tests deselected - pre-existing order/timing-dependent flakes, reproduce on aarch64 too, not riscv64-specific

License: OK

Built on cp310-abi3 (aarch64 rehearsal, same manylinux image family); 4599 passed, 30 skipped, 2 deselected, 1 xfailed.