Add GitHub action for continuous integration

.github/workflows/run-ci.yaml

@@ -0,0 +1,34 @@
+name: Run CI
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.10'
+
+      - name: Install using Poetry
+        run: |
+          pip install poetry
+          poetry install
+
+      - name: Run tests
+        run: |
+          poetry run ruff format --check src
+          poetry run ruff check src
+          poetry run mypy src
+          poetry run muffin --version