Exposes tiller.log as artifact

changelogs/unreleased/expose-tiller-log.yml

+---
+title: Exposes tiller.log as artifact in Managed-Cluster-Applications GitLab CI template
+merge_request: 22940
+author:
+type: changed

doc/user/clusters/applications.md

@@ -505,7 +505,10 @@ To install applications using GitLab CI:
    customize values for the installed application.
 
 A GitLab CI pipeline will then run on the `master` branch to install the
-applications you have configured.
+applications you have configured. In case of pipeline failure, the
+output of the [Helm
+Tiller](https://v2.helm.sh/docs/install/#running-tiller-locally) binary
+will be saved as a [CI job artifact](../project/pipelines/job_artifacts.md).
 
 ### Install Ingress using GitLab CI
 

lib/gitlab/ci/templates/Managed-Cluster-Applications.gitlab-ci.yml

@@ -14,3 +14,7 @@ apply:
   only:
     refs:
       - master
+  artifacts:
+    when: on_failure
+    paths:
+      - tiller.log