Add html test-report

Add html report to lbmpy test runs (like pystencils). So human don't need to read terminal gibberish but can directly browse the html (e.g.: http://seitz.pages.walberla.net/-/lbmpy/-/jobs/416980/artifacts/test-report/index.html)

Might be a good idea to add this also to the god jobs in pystencils/lbmpy.

For some, reason the apt-get installed pytest does not like pytest-html

.gitlab-ci.yml

@@ -18,7 +18,7 @@ tests-and-coverage:
     - echo "backend:template" > ~/.config/matplotlib/matplotlibrc
     - mkdir public
     - pip install git+https://gitlab-ci-token:${CI_JOB_TOKEN}@i10git.cs.fau.de/pycodegen/pystencils.git@master#egg=pystencils
-    - py.test -v -n $NUM_CORES --cov-report html --cov-report term --cov=. -m "not longrun"
+    - py.test -v -n $NUM_CORES --cov-report html --cov-report term --cov=. -m "not longrun" --html test-report/index.html
   tags:
     - docker
     - cuda11
@@ -27,6 +27,7 @@ tests-and-coverage:
     when: always
     paths:
       - coverage_report
+      - test-report
 
 # Nightly test  - runs "long run" jobs only
 test-longrun:
@@ -40,7 +41,7 @@ test-longrun:
     - mkdir -p ~/.config/matplotlib
     - echo "backend:template" > ~/.config/matplotlib/matplotlibrc
     - pip install git+https://gitlab-ci-token:${CI_JOB_TOKEN}@i10git.cs.fau.de/pycodegen/pystencils.git@master#egg=pystencils
-    - py.test -v -n $NUM_CORES --cov-report html --cov-report term --cov=.
+    - py.test -v -n $NUM_CORES --cov-report html --cov-report term --cov=. --html test-report/index.html
   tags:
     - docker
     - cuda11
@@ -48,6 +49,7 @@ test-longrun:
   artifacts:
     paths:
       - coverage_report
+      - test-report
 
 # Minimal tests in windows environment
 minimal-windows: