CI: add the upload of slides

.gitlab-ci.yml

@@ -21,4 +21,17 @@ build-image:
   extends: .dind_base
   script:
     - docker build -t $CI_REGISTRY_IMAGE slides/.
-    - docker push $CI_REGISTRY_IMAGE
\ No newline at end of file
+    - docker push $CI_REGISTRY_IMAGE
+
+stages:
+  - pages
+
+pages:
+  image: gitlab-registry.irstea.fr/nicolas.narcon/presentation-pyotb-foss4g
+  stage: pages
+  script:
+    - mv /public public
+    - mv slides/* public
+  artifacts:
+    paths:
+      - public
\ No newline at end of file