add mypy to CI

.github/workflows/ci.yml

@@ -41,4 +41,31 @@ jobs:
           files: ./coverage.xml
           # fail_ci_if_error: false
           name: codecov-umbrella
-          verbose: true
+          verbose: true
+
+  mypy:
+    name: mypy
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python 3.13
+        uses: actions/setup-python@v4
+        with:
+          python-version: "3.13"
+
+      - name: Install PDM
+        run: |
+          python -m pip install --upgrade pip
+          pip install pdm
+
+      - name: Install dependencies
+        run: |
+          pdm install -G:all
+
+      - name: Verify type hints
+        run: |
+          pdm run mypy

README.md

@@ -4,6 +4,7 @@
 
 [![CI](https://github.com/jpstroop/fitbit-client-python/actions/workflows/ci.yml/badge.svg)](https://github.com/jpstroop/fitbit-client-python/actions/workflows/ci.yml)
 [![codecov](https://codecov.io/gh/jpstroop/fitbit-client-python/graph/badge.svg?token=DM0JD8VKZ4)](https://codecov.io/gh/jpstroop/fitbit-client-python)
+[![Checked with mypy](https://www.mypy-lang.org/static/mypy_badge.svg)](https://mypy-lang.org/)
 [![Code style: black](https://img.shields.io/badge/code%20style-black-000000.svg)](https://github.com/psf/black)
 [![Python 3.13+](https://img.shields.io/badge/python-3.13+-blue.svg)](https://www.python.org/downloads/release/python-3130/)
 [![License: AGPL v3](https://img.shields.io/badge/License-AGPL%20v3-blue.svg)](https://www.gnu.org/licenses/agpl-3.0)