Documentation: Explain Jira app self-managed setup

We have a section in the docs about installing the GitLab for Jira app for self-managed instances. It explains two workarounds. With the proxy solution in place, we need to explain this too. We should also mention that using the proxy means that Jira secrets are shared with GitLab.com.

The setup will look like this:

  1. On the self-managed instance, go to admin/applications
  2. Click New Application
  3. Fill the fields
    • Name: 'GitLab for Jira App'
    • Redirect URI: https://gitlab.com/-/jira_connect/oauth_callbacks
    • Scopes: api
    • Make sure Trusted and Confidential are not selected
  4. Click Save Application
  5. Copy Application ID
  6. Go to admin/application_settings/general
  7. Expand GitLab for Jira App
  8. Paste the Application ID
  9. Set Jira Connect Proxy URL to https://gitlab.com
  10. Click Save changes
  11. Go to the app marketplace listing and install the app
  12. Select Self-managed
  13. Insert the URL of your GitLab instance

Once the documentation is in place, it should be linked here instead of the marketplace listing

Edited by Andy Schoenen