Publish to PyPI when version tags are pushed.

Add a tag-triggered publish workflow matching sdk-python: build, verify
the tag matches pyproject.toml, and upload via PyPI Trusted Publishing.

Author: eddietejeda

.github/workflows/publish.yml

@@ -0,0 +1,70 @@
+name: Publish to PyPI
+
+on:
+  push:
+    tags:
+      - 'v[0-9]*'
+
+concurrency:
+  group: pypi-publish-${{ github.ref_name }}
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
+
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6
+        with:
+          python-version: '3.12'
+
+      - name: Install build tooling
+        run: python -m pip install --upgrade build twine
+
+      - name: Verify tag matches pyproject version
+        run: |
+          # Release tags must start with `v` followed by a PEP 440 version (e.g. v1.2.3, v1.2.3a1).
+          if [[ ! "$GITHUB_REF_NAME" =~ ^v[0-9] ]]; then
+            echo "Release tag '$GITHUB_REF_NAME' must start with 'v' followed by a digit (e.g. v1.0.0)" >&2
+            exit 1
+          fi
+          tag="${GITHUB_REF_NAME#v}"
+          pkg_version=$(python -c "import tomllib,pathlib; print(tomllib.loads(pathlib.Path('pyproject.toml').read_text())['project']['version'])")
+          if [ "$tag" != "$pkg_version" ]; then
+            echo "Release tag ($tag) does not match pyproject.toml version ($pkg_version)" >&2
+            exit 1
+          fi
+
+      - name: Build sdist and wheel
+        run: python -m build
+
+      - name: Check distribution metadata
+        run: python -m twine check --strict dist/*
+
+      - uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
+        with:
+          name: dist
+          path: dist/
+
+  publish:
+    name: Publish to PyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/hotdata-runtime
+    permissions:
+      id-token: write
+    steps:
+      - uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 # v5
+        with:
+          name: dist
+          path: dist/
+
+      - name: Publish via Trusted Publishing
+        uses: pypa/gh-action-pypi-publish@ed0c53931b1dc9bd32cbe73a98c7f6766f8a527e # v1.13.0