build(ci): run mypy in CI alongside linting

Signed-off-by: Hal Blackburn <[email protected]>

Author: h4l

.github/workflows/main.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install dev dependencies
         run: python -m pip install -r requirements/dev.txt
       - name: Run linting
-        run: python -m tox -e lint
+        run: python -m tox -e lint,mypy,mypy-samples-image,mypy-samples-json
 
   test:
     strategy: