Add GitHub Actions workflow for Python package release

Author: kozo2

.github/workflows/newrelease.yml

@@ -0,0 +1,63 @@
+name: Upload Python Package
+
+on:
+  push:
+    branches: [master]
+    paths:
+      - 'setup.py'
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write  # needed for Trusted Publishing
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Check version bump
+        id: version_check
+        run: |
+          NEW_VERSION=$(python -c "import re; print(re.search(r\"version='([^']+)'\", open('setup.py').read()).group(1))")
+          echo "version=$NEW_VERSION" >> "$GITHUB_OUTPUT"
+          pip install ecell4 2>/dev/null && \
+            CURRENT_VERSION=$(pip show ecell4 | grep ^Version | awk '{print $2}') || \
+            CURRENT_VERSION="0.0.0"
+          if [ "$NEW_VERSION" = "$CURRENT_VERSION" ]; then
+            echo "changed=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "changed=true" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Set up Python
+        if: steps.version_check.outputs.changed == 'true'
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Install build tooling
+        if: steps.version_check.outputs.changed == 'true'
+        run: |
+          python -m pip install --upgrade pip
+          pip install build
+
+      - name: Build
+        if: steps.version_check.outputs.changed == 'true'
+        run: python -m build
+
+      - name: Publish to PyPI
+        if: steps.version_check.outputs.changed == 'true'
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+      - name: Create GitHub Release
+        if: steps.version_check.outputs.changed == 'true'
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION=${{ steps.version_check.outputs.version }}
+          git tag "v${VERSION}"
+          git push origin "v${VERSION}"
+          gh release create "v${VERSION}" dist/* \
+            --title "v${VERSION}" \
+            --generate-notes