feat: receive update from upsteam

.gitlab-ci.yml

 stages:
+  - update-projects
   - build
   - deploy
 
+# autoupdate the viewer on upstream changes
+# triggered by the upstream pipeline!
+update-viewer:
+  image: 
+  stage: update-projects
+  rules:
+    - if: '$UPDATE == "true"'
+    - if: '$UPSTREAM_COMMIT_SHA'
+  script:
+    - 'curl --request PUT --header "PRIVATE-TOKEN: $PROJECT_ACCESS_TOKEN" "$CI_API_V4_URL/projects/$CI_PROJECT_ID/repository/submodules/Qviewer" --data "branch=develop&commit_sha=$UPSTREAM_COMMIT_SHA&commit_message=update: Qviewer"' 
+
 # build the frontend viewer with a custom index.html
 build:
   image: docker.gitlab.gwdg.de/subugoe/emo/qviewer/node:latest
@@ -57,13 +69,3 @@ release:
     paths:
       - gitlab-release.json
 
-.update:
-  image: docker.gitlab.gwdg.de/fontane-notizbuecher/build:latest
-  stage: update
-  variables:
-    VIEWER_PROJECT_ID: 6474
-  script:
-    - url=$(curl "$CI_API_V4_URL/projects/$VIEWER_PROJECT_ID/releases" | jq '.[0].assets.links[0].url')
-    - curl --output viewer.zip $url
-    - unzip viewer.zip
-    - mv dist/* . && rm dist/