Move to GitHub Actions

This is copied over from Django Lightweight Queue, with light modifications.

.github/workflows/check.yml

@@ -0,0 +1,50 @@
+name: Check
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        django-version: ["3.2", "4.0", "4.1", "4.2", "5.0"]
+        exclude:
+          # Python 3.11 is not supported until Django 4.1
+          - python-version: "3.11"
+            django-version: "3.2"
+          - python-version: "3.11"
+            django-version: "4.0"
+
+          # Python <3.10 is not supported by Django 5.0+
+          - python-version: "3.8"
+            django-version: "5.0"
+          - python-version: "3.9"
+            django-version: "5.0"
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Poetry
+        run: pipx install poetry==1.3.2
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: poetry
+
+      - name: Set up dependencies
+        run: |
+          poetry install
+          poetry run pip install "django~=${{ matrix.django-version }}.0"
+
+      - name: Run tests
+        run: poetry run ./runtests

.github/workflows/publish.yml

@@ -0,0 +1,45 @@
+name: Create Release & Publish to PYPI
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  run-checks:
+    uses: ./.github/workflows/check.yml
+
+  publish:
+    runs-on: ubuntu-latest
+    needs:
+      - run-checks
+    steps:
+      - uses: actions/checkout@v4
+
+      # work around actions/checkout stripping annotations https://github.com/actions/checkout/issues/290
+      - name: Fetch tags
+        run: git fetch --tags --force
+
+      - name: Set up Poetry
+        run: pipx install poetry==1.3.2
+
+      - name: Set up Python
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.9'
+          cache: poetry
+
+      - name: Build
+        run: poetry build
+
+      - name: Publish to PyPI
+        run: |
+          poetry publish \
+            --username "${PYPI_USERNAME}" \
+            --password "${PYPI_PASSWORD}" \
+            --no-interaction
+
+      - name: Create GitHub Release
+        uses: ncipollo/release-action@v1
+        with:
+          body: ${{ steps.tag_data.outputs.git-tag-annotation }}