Add GitHub Actions Workflow for Testing

.github/workflows/test.yml

@@ -0,0 +1,45 @@
+name: CI with Tests and Code Coverage
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  release:
+    types:
+      - published
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    timeout-minutes: 15
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        shard: [0, 1, 2, 3]
+      fail-fast: false
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install dependencies
+        run: |
+          pip install -U pip setuptools wheel
+          SETUPTOOLS_ENABLE_FEATURES=legacy-editable pip install -r ./requirements.txt
+          pip install -r ./requirements-dev.txt
+
+      - name: Run pytest tests in src/ directory
+        run: |
+          PYTHONPATH='src' pytest --num-shards=4 --shard-id=${{ matrix.shard }} tests/