CI: Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,68 @@
+name: release
+
+permissions:
+  contents: read
+
+on:
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+jobs:
+
+  distribution:
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Setup Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: 3
+
+    - name: Upgrade pip
+      run:  python -m pip install -U pip
+
+    - name: Install build and twine
+      run:  python -m pip install -U build twine
+
+    - name: Build distribution
+      run:  python -m build --sdist
+
+    - name: Check source distribution
+      run:  python -m twine check dist/*.tar.gz
+
+    - name: Upload distribution assets
+      uses: actions/upload-artifact@v4
+      with:
+        name: release
+        path: |
+          dist/*.tar.gz
+
+
+  pypi-publish:
+
+    if: ${{ github.event_name == 'release' }}
+    name: Upload release to PyPI
+    runs-on: ubuntu-latest
+    needs: distribution
+    environment:
+      name: pypi
+      url: https://pypi.org/p/mpi4py-fft
+    permissions:
+      id-token: write
+
+    steps:
+
+    - name: Download distribution assets
+      uses: actions/download-artifact@v4
+      with:
+        name: release
+        path: dist
+
+    - name: Publish package distributions to PyPI
+      uses: pypa/gh-action-pypi-publish@release/v1