Improving CICD tests stability (#1481)

* First approach

* Changing time to 2 seconds

* Upload the requirements

* Preparing flag.

* Update tests/test_grpc.py

* Increasing delays and reruns.

Author: germa89

.github/workflows/ci.yml

@@ -354,7 +354,7 @@ jobs:
 
       - name: Unit Testing
         run: |
-          xvfb-run pytest -v --durations=10 --maxfail=10 --cov=ansys.mapdl.core --cov-report=xml --cov-report=html
+          xvfb-run pytest -v --durations=10 --maxfail=10  --reruns 7 --reruns-delay 3 --only-rerun MapdlExitedError  --cov=ansys.mapdl.core --cov-report=xml --cov-report=html
 
       - uses: codecov/codecov-action@v3
         if: matrix.mapdl-version == 'v21.2.1'

requirements/requirements_tests.txt

@@ -7,4 +7,5 @@ pytest-cov==3.0.0
 pyvista==0.36.1
 pyansys-tools-report==0.3.2
 vtk==9.0.3
-ansys-dpf-core==0.6.0
+pytest-rerunfailures==10.2
+ansys-dpf-core==0.6.0