Add mypy linter step

.github/workflows/lint.yml

@@ -4,7 +4,7 @@ on:
   pull_request:
 
 jobs:
-  lint:
+  flake8:
     runs-on: ubuntu-latest
 
     steps:
@@ -15,4 +15,21 @@ jobs:
       - uses: TrueBrain/actions-flake8@v2
         with:
           flake8_version: 6.0.0
-          plugins: flake8-isort==6.1.1 flake8-quotes==3.4.0 flake8-commas==4.0.0 
+          plugins: flake8-isort==6.1.1 flake8-quotes==3.4.0 flake8-commas==4.0.0
+
+  mypy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: 3.9
+
+      - run: pip install mypy==1.14.1
+
+      - run: |
+          mypy \
+            --non-interactive \
+            --install-types \
+            .

pyproject.toml

@@ -52,3 +52,14 @@ markers = [
 
 [tool.isort]
 profile = "black"
+
+[tool.mypy]
+# warn_redundant_casts = true
+# warn_unused_ignores = true
+# warn_unreachable = true
+# strict_equality = true
+# check_untyped_defs = true
+# install_types = true
+# non_interactive = true
+# pretty = true
+disable_error_code = ["import-untyped"]