Move from Azure Pipelines to GitHub Actions

.github/workflows/build-release.yml

@@ -0,0 +1,50 @@
+name: build
+on:
+  pull_request:
+  # Run builds nightly to catch incompatibilities with new marshmallow releases
+  schedule:
+  - cron: "0 0 * * *"
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - run: python -m pip install --upgrade pip wheel
+      - run: pip install tox
+      - run: tox -elint
+  tests:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - {name: '3.7-ma3', python: '3.7', os: ubuntu-latest, tox: py37-marshmallow3}
+          - {name: '3.10-ma3', python: '3.10', os: ubuntu-latest, tox: py310-marshmallow3}
+          - {name: '3.10-madev', python: '3.10', os: ubuntu-latest, tox: py310-marshmallowdev}
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python }}
+      - run: python -m pip install --upgrade pip wheel
+      - run: pip install tox
+      - run: tox -e${{ matrix.tox }}
+  release:
+    needs: [lint, tests]
+    name: PyPI release
+    if: startsWith(github.ref, 'refs/tags')
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-python@v2
+      - name: install requirements
+        run: python -m pip install build twine
+      - name: build dists
+        run: python -m build
+      - name: check package metadata
+        run: twine check dist/*
+      - name: publish
+        run: twine upload -u __token__ -p ${{ secrets.PYPI_API_TOKEN }} dist/*