ci: add tests workflow

.github/pytest.ini

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+[pytest]
+addopts = --cov=aim --cov-report=term-missing:skip-covered

.github/workflows/tests.yaml

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+name: Run Tests
+
+on: push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Create .env file
+        run: cat env.* > .env
+      - name: Load .env file
+        uses: xom9ikk/dotenv@v2.3.0
+      - name: Install poetry
+        run: pipx install poetry
+      - name: Set up Python 3.11
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+          cache: 'poetry'
+      - run: poetry install
+      - name: setup pytest.ini
+        run: mv .github/pytest.ini pytest.ini
+      - name: Run tests
+        run: poetry run pytest