Upload distribution to PyPI (#3)

.github/workflows/sdist.yml

@@ -0,0 +1,48 @@
+name: sdist
+
+on:
+  workflow_dispatch:
+  pull_request:
+  push:
+    branches:
+     - main
+  release:
+    types:
+      - published
+
+jobs:
+
+  build_sdist:
+    name: Build sdist
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Build SDist
+        run: pipx run build --sdist
+
+      - name: Check metadata
+        run: pipx run twine check dist/*
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: build
+          path: dist
+
+  upload_sdist:
+    name: Upload sdist
+    needs: [build_sdist]
+    runs-on: ubuntu-latest
+    permissions:
+      # IMPORTANT: this permission is mandatory for trusted publishing
+      id-token: write
+    if: github.event_name == 'release' && github.event.action == 'published'
+
+    steps:
+      - uses: actions/download-artifact@v4
+        with:
+          name: build
+          path: dist
+
+      - name: Publish package distributions to PyPI
+        uses: pypa/gh-action-pypi-publish@release/v1