Add pypi workflow

Author: jorgensd

.github/workflows/pypi.yml

@@ -0,0 +1,44 @@
+name: Release
+
+on: [push, pull_request]
+
+jobs:
+  dist:
+    runs-on: ubuntu-latest
+    container: ghcr.io/fenics/dolfinx/dolfinx:nightly
+    env:
+      DEB_PYTHON_INSTALL_LAYOUT: deb_system
+
+    steps:
+    - uses: actions/checkout@v5
+
+    - name: Install build dependencies
+      run: |
+        python3 -m pip install --upgrade build twine
+        python3 -m pip install -r build-requirements.txt
+
+    - name: Build SDist and wheel
+      run: python3 -m build --no-isolation --sdist
+
+    - uses: actions/upload-artifact@v4
+      with:
+        path: dist/*
+
+    - name: Check metadata
+      run: python3 -m twine check dist/*
+
+  publish:
+    needs: [dist]
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags')
+    environment: pypi
+    permissions:
+      id-token: write
+
+    steps:
+    - uses: actions/download-artifact@v5
+      with:
+        name: artifact
+        path: dist
+
+    - uses: pypa/gh-action-pypi-publish@release/v1