Add GitHub actions release workflow

Author: flaeppe

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: Release
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build-and-publish:
+    runs-on: ubuntu-latest
+    environment:
+      name: release
+      url: https://pypi.org/p/django-stubs
+    permissions:
+      id-token: write
+    steps:
+      - name: Setup python to build package
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install build
+        run: python -m pip install build
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Build package
+        run: python -m build
+      - name: Publish to PyPI
+        uses: pypa/[email protected]

.github/workflows/test.yml

@@ -133,3 +133,23 @@ jobs:
 
       - name: Run django-stubs-ext tests
         run: PYTHONPATH='.' pytest ext
+
+  build-and-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-tags: true
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+      - name: Install dependencies
+        run: python3 -m pip install --upgrade build twine
+      - name: Build
+        run: |
+          python3 -m build --sdist --wheel .
+          python3 -m build --sdist --wheel ext/
+      - name: Check package metadata
+        run: |
+          twine check --strict dist/*
+          twine check --strict ext/dist/*