ci: publish to PyPI on version tags

[KylinMountain]

Adds a tag-triggered PyPI release workflow directly on main, so the stable branch owns the release infrastructure independently of dev.

What it does

Pushing a PEP 440 tag with a leading v (v0.3.0, v0.3.0rc1, v0.3.0.dev2, …) triggers .github/workflows/publish.yml, which:

1. derives the version from the tag and injects it into pyproject.toml;
2. builds sdist + wheel;
3. publishes to PyPI via OIDC trusted publishing (no stored token/secret);
4. creates a GitHub Release with auto-generated notes.

Scope

Single file: .github/workflows/publish.yml. No code changes.

Supersedes the dev-based #347 (same workflow, targeted at main instead).

[rejojer]

Code review

Found 1 issue:

1. Workflow will always fail: pyproject.toml does not exist on main (bug: missing build dependency on target branch)

The workflow's build step assumes pyproject.toml exists at the repo root, but main has no pyproject.toml, setup.py, or setup.cfg — only a flat requirements.txt. The file only exists on dev. Under set -euo pipefail, sed -i will fail immediately with "No such file or directory" on every tag push, making the workflow completely non-functional.

This appears to have been copied from PR #347 (which correctly targets dev) without accounting for the packaging divergence between main and dev. To fix, either: (a) add pyproject.toml with a [build-system] table to main before or as part of this PR, (b) retarget this PR to dev, or (c) merge one of the pending packaging PRs (e.g. #211) to main first.

PageIndex/.github/workflows/publish.yml

Lines 43 to 52 in e048991

	python -m pip install --upgrade build packaging
	VERSION="${GITHUB_REF_NAME#v}"
	echo "Publishing version: $VERSION"
	# Fail early on a malformed tag instead of publishing a junk version.
	python -c "from packaging.version import Version; Version('$VERSION')"
	# The git tag is the single source of truth; overwrite the static
	# placeholder in [tool.poetry] so the built artifacts carry $VERSION.
	sed -i "s/^version = .*/version = \"$VERSION\"/" pyproject.toml
	grep '^version = ' pyproject.toml
	python -m build

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[KylinMountain]

closed as #347 has merged into dev.