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Merge branch '38021-add-instructions-for-upgrading-from-ce-to-ee-using-gitlab-omnibus-chart-docs' into 'master'

Add instructions for upgrading from CE to EE using GitLab Omnibus chart - docs

Closes #38021

See merge request gitlab-org/gitlab-ce!14347

doc/install/kubernetes/gitlab_omnibus.md

@@ -155,6 +155,22 @@ should we done using `helm upgrade`:
 helm upgrade -f values.yaml gitlab gitlab/gitlab-omnibus
 ```
 
+## Upgrading from CE to EE using the Helm Chart
+
+If you have installed the Community Edition using this chart, upgrading to Enterprise Edition is easy.
+
+If you are using a `values.yaml` file to specify the configuration options, edit the file and set `gitlab=ee`. If you would like to run a specific version of GitLab EE, set `gitlabEEImage` to be the desired GitLab [docker image](https://hub.docker.com/r/gitlab/gitlab-ee/tags/). Then you can use `helm upgrade` to update your GitLab instance to EE:
+
+```bash
+helm upgrade -f values.yaml gitlab gitlab/gitlab-omnibus
+```
+
+You can also upgrade and specify these options via the command line:
+
+```bash
+helm upgrade gitlab --set gitlab=ee,gitlabEEImage=gitlab/gitlab-ee:9.5.5-ee.0 gitlab/gitlab-omnibus
+```
+
 ## Uninstalling GitLab using the Helm Chart
 
 To uninstall the GitLab Chart, run the following: