feat: Add ref input to publish workflow for tag-specific builds

[shaia]

When using workflow_dispatch, you can now specify a git ref (e.g., v0.1.6) to build from. This ensures setuptools-scm generates the correct version instead of a dev version with local identifier that PyPI rejects.

[Copilot]

Pull request overview

This PR adds a ref input parameter to the publish and build-wheels workflows, enabling tag-specific builds when manually triggered. This ensures that setuptools-scm generates the correct version number for the specified git ref (e.g., a tag like v0.1.6) rather than a development version with local identifiers that PyPI rejects.

Key Changes:

• Added optional ref input to workflow_dispatch and workflow_call triggers
• Modified checkout actions to use the specified ref with fallback to github.ref

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/publish.yml	Added ref input parameter to workflow_dispatch; passed ref to build-wheels workflow via workflow_call; updated build_sdist checkout to use specified ref
.github/workflows/build-wheels.yml	Added ref input parameters for both workflow_dispatch and workflow_call triggers; updated build_wheel checkout to use specified ref

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