establish GitHub actions testing

.github/workflows/ci.yml

@@ -0,0 +1,115 @@
+name: Django Test Suite
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    services:
+      postgres:
+        image: postgres:13
+        ports:
+          - 5432:5432
+        env:
+          POSTGRES_DB: pguser
+          POSTGRES_USER: pguser
+          POSTGRES_PASSWORD: foobar
+        options: >-
+          --health-cmd "pg_isready -U pguser"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+      redis:
+        image: redis:latest
+        ports:
+          - 6379:6379
+        options: >-
+          --health-cmd "redis-cli ping"
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    env:
+      DATABASE_NAME: pguser
+      DATABASE_USER: pguser
+      DATABASE_PASSWORD: foobar
+      DATABASE_HOST: 127.0.0.1
+      DATABASE_PORT: 5432
+      REDIS_URL: redis://127.0.0.1:6379/0
+
+    strategy:
+      fail-fast: false
+      matrix:
+        django-version: ["3.2", "4.0", "4.1", "4.2", "5.0"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
+        exclude:
+          # Exclusions for Django 3.2
+          - python-version: "3.11"
+            django-version: "3.2"
+          - python-version: "3.12"
+            django-version: "3.2"
+          # Exclusions for Django 4.0
+          - python-version: "3.6"
+            django-version: "4.0"
+          - python-version: "3.7"
+            django-version: "4.0"
+          - python-version: "3.11"
+            django-version: "4.0"
+          - python-version: "3.12"
+            django-version: "4.0"
+          # Exclusions for Django 4.1
+          - python-version: "3.6"
+            django-version: "4.1"
+          - python-version: "3.7"
+            django-version: "4.1"
+          # Exclusions for Django 4.2
+          - python-version: "3.6"
+            django-version: "4.2"
+          - python-version: "3.7"
+            django-version: "4.2"
+          # Exclusions for Django 5.0
+          - python-version: "3.6"
+            django-version: "5.0"
+          - python-version: "3.7"
+            django-version: "5.0"
+          - python-version: "3.8"
+            django-version: "5.0"
+          - python-version: "3.9"
+            django-version: "5.0"
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v2
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        pip install django==${{ matrix.django-version }}
+        pip install -r requirements.txt
+        pip install psycopg2-binary
+
+    - name: Run migrations
+      run: |
+        python manage.py migrate
+
+    - name: Run tests
+      run: |
+        python manage.py test
+
+    - name: Upload coverage to Codecov
+      uses: codecov/codecov-action@v2
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}
+        fail_ci_if_error: true