added github action to run mypy

Author: bodintsov

.github/workflows/run_tests.yml

@@ -63,6 +63,9 @@ jobs:
       - name: flake it
         run: poetry run flake8 .
 
+      - name: run mypy
+        run: poetry run mypy .
+
       - name: run tests
         run: |
           poetry run coverage run -m pytest --create-db