Automatically publish new versions

.github/workflows/build.yml

@@ -1,6 +1,9 @@
-name: build
+name: build & publish
 on: push
 
+permissions:
+  contents: write  # Required for creating releases and tags
+
 jobs:
   test:
     strategy:
@@ -9,12 +12,98 @@ jobs:
         python_version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.1.0
-      - uses: actions/setup-python@v4
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python_version }}
           cache-dependency-path: "**/requirements-dev.txt"
       - name: Test
         run: |-
           pip install -r requirements-dev.txt
           pytest
+
+  build:
+    runs-on: ubuntu-latest
+    needs:
+      - test
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: Install build dependencies
+        run: python -m pip install --upgrade build
+      - name: Build package
+        run: python -m build
+      - uses: actions/upload-artifact@v4
+        with:
+          name: dist
+          path: dist/
+
+  check_version:
+    if: github.ref == 'refs/heads/master'
+    runs-on: ubuntu-latest
+    outputs:
+      should_publish: ${{ steps.check.outputs.should_publish }}
+      version: ${{ steps.check.outputs.version }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check if version tag exists
+        id: check
+        run: |
+          VERSION=$(python -c "import re; print(re.search(r\"version\s*=\s*['\"']([^'\"']+)['\"']\", open('setup.py').read()).group(1))")
+          echo "version=$VERSION" >> $GITHUB_OUTPUT
+          if git rev-parse "v${VERSION}" >/dev/null 2>&1; then
+            echo "Tag v${VERSION} already exists, skipping publish"
+            echo "should_publish=false" >> $GITHUB_OUTPUT
+          else
+            echo "Tag v${VERSION} does not exist, will publish"
+            echo "should_publish=true" >> $GITHUB_OUTPUT
+          fi
+
+  publish_to_pypi:
+    if: github.ref == 'refs/heads/master' && needs.check_version.outputs.should_publish == 'true'
+    runs-on: ubuntu-latest
+    needs:
+      - build
+      - check_version
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.13"
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install setuptools wheel twine
+      - uses: actions/download-artifact@v4
+        with:
+          name: dist
+          path: dist/
+      - name: Publish to PyPI
+        env:
+          TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
+          TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
+        run: twine upload dist/*
+
+  create_release:
+    if: github.ref == 'refs/heads/master' && needs.check_version.outputs.should_publish == 'true'
+    runs-on: ubuntu-latest
+    needs:
+      - publish_to_pypi
+      - check_version
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Create tag and release
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git tag v${{ needs.check_version.outputs.version }}
+          git push origin v${{ needs.check_version.outputs.version }}
+          gh release create v${{ needs.check_version.outputs.version }} --generate-notes
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}