feat(google-crc32c): add riscv64 manylinux wheel builds

[gounthar]

Intra-fork PR to validate CI before upstream googleapis#16559 is reviewed.

Summary by CodeRabbit

• Chores
  • Added automated build and distribution pipeline for the riscv64 architecture, enabling users on RISC-V 64-bit systems to install the library.
  • Expanded continuous integration to generate wheels for riscv64 alongside existing x86_64 and aarch64 targets.

[coderabbitai]

📝 Walkthrough

Walkthrough

These changes add RISC-V 64-bit (riscv64) architecture support to the google-crc32c package's build pipeline. A new GitHub Actions workflow handles riscv64 wheel builds via QEMU emulation, while the build script is extended to include the riscv64 build step alongside existing architectures.

Changes

Cohort / File(s)	Summary
RISC-V 64-bit Build Support packages/google-crc32c/.github/workflows/riscv64-wheels.yml, packages/google-crc32c/scripts/manylinux/build.sh	Introduces riscv64 architecture support with a new GitHub Actions workflow for building wheels via QEMU emulation and extends the build script to include a riscv64 build step using the manylinux_2_39_riscv64 container image.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 riscv64 wheels now roll so bright,
Through QEMU's magic, day and night!
New architectures join the race,
CI pipelines find their place! 🚀✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(google-crc32c): add riscv64 manylinux wheel builds' directly and clearly summarizes the main change: adding riscv64 architecture support to the manylinux wheel build process for google-crc32c.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/google-crc32c-riscv64-wheels

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[gemini-code-assist]

Code Review

This pull request introduces a GitHub Actions workflow for building riscv64 wheels and updates the manylinux build script to support the new architecture. Feedback identifies an unnecessary interactive flag and missing variable quotes in the build script, as well as a discrepancy where the BUILD_PYTHON environment variable is omitted in the CI workflow.

[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@packages/google-crc32c/scripts/manylinux/build.sh`:
- Around line 59-60: The docker run invocation in build.sh uses unquoted
variable expansions (e.g., --volume ${REPO_ROOT}:/var/code/python-crc32c/ and
--env BUILD_PYTHON=${BUILD_PYTHON}), which can break with spaces or glob
characters; update the docker run args to wrap expansions in double quotes (for
example quote the --volume and --env values as "--volume
\"${REPO_ROOT}:/var/code/python-crc32c/\"" and "--env
\"BUILD_PYTHON=${BUILD_PYTHON}\"") and audit any other docker run arguments in
the script for similar unquoted expansions.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 10319551-f913-452d-aea1-30045e9a3d32

📥 Commits

Reviewing files that changed from the base of the PR and between 614a3d0 and 6d1b7e4.

📒 Files selected for processing (2)

• packages/google-crc32c/.github/workflows/riscv64-wheels.yml
• packages/google-crc32c/scripts/manylinux/build.sh