ci: add mypy check (#161)

* ci: add mypy check

* fix remaining mypy issues

* ignore whole methods

.github/workflows/mypy.yaml

@@ -0,0 +1,33 @@
+name: MyPy
+
+on: [ push, pull_request ]
+
+
+jobs:
+  mypy:
+    name: Run MyPy
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          # pyside 6.6.3 has some issue in their .pyi files
+          pip install PySide6==6.6.2
+          pip install -r requirements.txt
+          pip install mypy==1.10.0
+
+      - name: Run MyPy
+        run: |
+          cd tagstudio
+          mkdir -p .mypy_cache
+          mypy --install-types --non-interactive 
+          mypy --config-file ../pyproject.toml .