Add CI task to trigger a build of the repository pipeline. Hope this works...

.gitlab-ci.yml

@@ -5,6 +5,7 @@ stages:
 - test
 - build
 - deploy
+- upload
 
 
 
@@ -123,3 +124,12 @@ release:
   - python package/release.py
   only:
   - tags
+
+
+repo:
+  stage: upload
+  trigger: s3lph/custom-packages
+  variables:
+    MULTIPROJECT_TRIGGER_JOBNAME: matemat
+  only:
+  - staging