Revert use of virtual environments to fix testing of parallel

processing. For some reasons, loadskernel is not found in a subprocess
and there were issues/interference when running multiple tests
simultaniously.

.gitlab-ci.yml

@@ -20,8 +20,7 @@ build:
     - lk
   script:
     - *virtualenv
-    - pip install git+https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.dlr.de/loads-kernel/panel-aero.git
-    - pip install .
+    - pip install -e .
 
 test:
   stage: test
@@ -32,11 +31,6 @@ test:
   dependencies:
     - build
   script:
-    # Set-up the environement
-    - *virtualenv
-    - pip install git+https://gitlab-ci-token:${CI_JOB_TOKEN}@gitlab.dlr.de/loads-kernel/panel-aero.git
-    # Install with -e (in editable mode) to allow the tracking of the test coverage
-    - pip install -e .
     - which python
     - which pytest
     - which mpiexec