Add GitHub Actions workflow (#1)

.github/workflows/tests.yml

@@ -0,0 +1,52 @@
+name: artwork-indexer tests
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-22.04
+
+    services:
+      db:
+        image: metabrainz/musicbrainz-test-database:production
+        env:
+          POSTGRES_HOST_AUTH_METHOD: trust
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Python 3.11
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.11"
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m venv .venv
+        . .venv/bin/activate
+        pip install -r requirements.txt
+    - name: Run flake8
+      run: |
+        . .venv/bin/activate
+        flake8 *.py tests/*.py --count --show-source --statistics
+    - name: Run tests
+      run: |
+        . .venv/bin/activate
+        cp config.tests.example.ini config.tests.ini
+        export PGHOST=localhost
+        export PGPORT=5432
+        export DROPDB_COMMAND='sudo -E -H -u postgres dropdb'
+        ./run_tests.sh