Add a workflow for CI

.github/workflows/ci.yml

@@ -0,0 +1,47 @@
+name: CI
+
+on:
+  push:
+    paths-ignore:
+      - '.gitignore'
+      - 'README.rst'
+  pull_request:
+    paths-ignore:
+      - '.gitignore'
+      - 'README.rst'
+
+permissions:
+  contents: read
+
+jobs:
+  unit-test:
+    runs-on: ${{ matrix.os }}
+    concurrency:
+      group: ${{ github.event_name }}-${{ github.workflow }}-${{ github.ref_name }}-ut-${{ matrix.os }}-${{ matrix.python-version }}
+      cancel-in-progress: true
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Setup Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v4
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+          cache-dependency-path: |
+            setup.py
+            **/*requirements.txt
+            tox.ini
+
+      - name: Install pip
+        run: python -m pip install --upgrade --disable-pip-version-check "pip>=21.1"
+
+      - run: make setup-ci
+
+      - run: tox -e py