fix: Rework CI

Author: AlejandroFernandezLuces

.github/workflows/run_mapdl_tests.yml

@@ -34,7 +34,10 @@ jobs:
           with:
             python-version: ${{ env.MAIN_PYTHON_VERSION }}
         - name: Install library, with test extra
-          run: python -m pip install .[tests]
+          run: |
+            python -m pip install .[tests]
+            python -m pip install tests/launcher/pkg_with_entrypoint
+
 
         - name: Unit testing
           run: |