ci(actions): Replace Travis CI with GitHub Actions workflow

.github/workflows/build.yml

@@ -0,0 +1,123 @@
+name: build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: Build and Test Package
+    strategy:
+          matrix:
+            version:
+              - '3.7'
+              - '3.8'
+              - '3.9'
+              - '3.10'
+              - '3.11'
+              - '3.12'
+            os: [ubuntu-latest, windows-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - name: Check out repository
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.version }}
+
+    - name: Install package
+      run: pip install .
+
+    - name: Run tests
+      run: python -m unittest discover -v
+
+    - name: Build documentation
+      run: |-
+        mkdir html
+        git fetch --all
+        python -I -m sphinx_multiversion -W docs html
+
+    - name: Upload the Docs
+      uses: actions/upload-artifact@v4
+      if: matrix.os == 'ubuntu-latest' && matrix.version == '3.12'
+      with:
+        name: docs
+        path: html/
+
+    - name: Install pypa/build
+      run: pip install build
+
+    - name: Build a binary wheel and a source tarball
+      run: python3 -m build
+
+    - name: Store the distribution packages
+      if: matrix.os == 'ubuntu-latest' && matrix.version == '3.12'
+      uses: actions/upload-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+  deploy-docs:
+    name: Deploy Docs to GitHub Pages
+    if: ${{ startsWith(github.ref, 'refs/tags/') || github.ref == 'refs/heads/master' }}
+    runs-on: ubuntu-latest
+    needs: [build]
+    permissions:
+      pages: write     # to deploy to Pages
+      id-token: write  # to verify the deployment originates from an appropriate source
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v4 # or specific "vX.X.X" version tag for this action
+        with:
+          artifact_name: docs
+
+  deploy-testpypi:
+    name: Deploy Distribution to Test PyPI
+    if: ${{ ! startsWith(github.ref, 'refs/tags/') }}
+    needs: [package]
+    runs-on: ubuntu-latest
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/sphinx-multiversion
+    permissions:
+      id-token: write
+
+    steps:
+    - name: Download the Distributions
+      uses: actions/download-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+    - name: Publish Distributions to Test PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+
+  deploy-pypi:
+    name: Deploy Distribution to PyPI
+    if: startsWith(github.ref, 'refs/tags/')
+    needs: [package]
+    runs-on: ubuntu-latest
+    environment:
+      name: pypi
+      url: https://pypi.org/p/sphinx-multiversion
+    permissions:
+      id-token: write
+
+    steps:
+    - name: Download the Distributions
+      uses: actions/download-artifact@v4
+      with:
+        name: python-package-distributions
+        path: dist/
+
+    - name: Publish Distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1
+