Add type checking of ragstack-ragulate (#616)

Author: cbornet

.github/workflows/ci-unit-tests.yml

@@ -95,6 +95,9 @@ jobs:
       - name: "Type check (knowledge-store)"
         run: tox -e type -c libs/knowledge-store && rm -rf libs/knowledge-store/.tox
 
+      - name: "Type check (ragulate)"
+        run: tox -e type -c libs/ragulate && rm -rf libs/ragulate/.tox
+
       - name: "Type check (test-utils)"
         run: tox -e type -c libs/tests-utils && rm -rf libs/tests-utils/.tox