CI: Publish PyPI releases using GitHub Actions workflows

Closes https://github.com/adrienverge/yamllint/issues/721

.github/workflows/publish.yaml

@@ -0,0 +1,101 @@
+---
+
+name: Publish
+
+on: push  # yamllint disable-line rule:truthy
+
+jobs:
+  build:
+    name: Build distribution package
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.x"
+      - name: Install pypa/build
+        run: python -m pip install --user build
+      - name: Build a binary wheel and a source tarball
+        run: python -m build
+      - name: Store the distribution packages
+        uses: actions/upload-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+
+  publish-to-testpypi:
+    name: Publish distribution package to TestPyPI
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/yamllint
+    permissions:
+      id-token: write
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - name: Publish distribution package
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+
+  publish-to-pypi:
+    name: Publish distribution package to PyPI
+    if: startsWith(github.ref, 'refs/tags/')  # only for tags
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/yamllint
+    permissions:
+      id-token: write
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - name: Publish distribution package
+        uses: pypa/gh-action-pypi-publish@release/v1
+
+  github-release:
+    name: Sign and upload GitHub Release
+    needs: publish-to-pypi
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      id-token: write
+    steps:
+      - name: Download all the dists
+        uses: actions/download-artifact@v4
+        with:
+          name: python-package-distributions
+          path: dist/
+      - name: Sign the dists with Sigstore
+        uses: sigstore/gh-action-sigstore-python@v3.0.0
+        with:
+          inputs: dist/yamllint-*.tar.gz dist/yamllint-*.whl
+      - name: Create GitHub Release
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run:
+          gh release create
+          "$GITHUB_REF_NAME"
+          --repo "$GITHUB_REPOSITORY"
+          --notes ""
+      - name: Upload artifact signatures to GitHub Release
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run:
+          gh release upload
+          "$GITHUB_REF_NAME"
+          dist/**
+          --repo "$GITHUB_REPOSITORY"