Ci: Add GitLab Pages deployment job for outreach website

.gitlab-ci.yml

@@ -3,6 +3,7 @@ stages:
     - report
     - build
     - test
+    - deploy
 
 # Reusable definitions
 .gradle-cache: &gradle-cache
@@ -119,3 +120,14 @@ test:
           allow_failure: false
         - if: '$CI_COMMIT_BRANCH'
           allow_failure: true
+
+pages:
+  stage: deploy
+  script:
+    - mkdir -p public
+    - cp -r outreach/* public/
+  artifacts:
+    paths:
+      - public/
+  rules:
+      - when: manual