Add the gitlab pages CI file to render test cases

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

.gitlab-ci.yml

+image: docker-registry.apertis.org/apertis/apertis-19.03-testcases-builder
+
+pages:
+  stage: deploy
+  script:
+    - cd renderer
+    - ./render-test-case ../tests-cases/ -d ../public/ --index-page
+  artifacts:
+    paths:
+      - public
+  only:
+    - master