aggregate fragment for docs, trigger doc rebuild

.gitlab-ci.yml

@@ -136,20 +136,38 @@ build_r:
 publish_listing:
   only:
     - docker-images
+    - rework-image-matrix-and-export
   needs: 
     - build_r
     - build_python
+  before_script:
+    - git fetch origin docs
+    - git checkout docs
   script: 
     - echo "built image,base os,R/Python,shiny-server" > image-list.csv
-    - cat image-list-fragments/*.csv >> image-list.csv
+    - cat image-list-fragments/*.csv >> image_list.csv
+    - WHEN=$(LC_TIME="en_US.utf8" date +"%b %G")
+    - sed "s/%%date%%/${WHEN}/g" source/user_guide/image_list.rst > image_list.rst
   artifacts:
     when: always
     paths:
-    - image-list.csv
+    - image_list.csv
+    - image_list.rst
     expire_in: 1 year
   
 
 
+update_docs:
+  only:
+    - docker-images
+    - rework-image-matrix-and-export
+  needs: ["publish_listing"]
+  trigger:
+    project: hub/shiny-k8s
+    branch: docs
+  
+
+
 trigger_r_example:
   needs: ["build_r"]
   trigger: