Fix error 500 on Runners page.

What does this MR do?

Fixes error 500 on Runners page (ActionView::Template::Error (Missing partial kaminari/_paginator)

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

What are the relevant issue numbers?

No GitLab issue; originally reported downstream: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=819903

Screenshots (if relevant)

N/A

Does this MR meet the acceptance criteria?

• CHANGELOG entry added
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the style guides
• Branch has no merge conflicts with master (if you do - rebase it please)
• Squashed related commits together

Added ~19173 label

@onlyjob Thanks for contributing back to GitLab, but I'm not sure this is an issue. I can reproduce. Can you provide steps to reproduce the problem this MR is trying to fix?

There is a problem, there is no doubts about it. ;) Description says it all: access "Runners" page and it crashes with error 500 on server side. I've experienced it myself (see https://git.fosscommunity.in/debian-ruby/TaskTracker/issues/107) and it was reported in Debian by Libor Klepáč who also provided a patch. I've tested (and corrected) his patch so I'm confident that it fixes the problem. Since all tests are passed I believe it should be safe to merge. Problem was spotted on official Debian package.

@onlyjob The last comment on https://git.fosscommunity.in/debian-ruby/TaskTracker/issues/107 says it's been fixed in 8.10.5. Do you confirm?

Added ~164274 label

@onlyjob Hmm, ok it seems that it's been fixed in https://anonscm.debian.org/cgit/pkg-ruby-extras/gitlab.git/tree/debian/patches/runners.patch but the fix needs to be merged upstream (here). The fix looks good to me, I'm wondering why we don't just set the gitlab theme as the default, though...

Thanks @onlyjob!

Added ~149423 label

Milestone changed to %8.13

Reassigned to @rymai

Status changed to merged

Mentioned in commit 434ad2b9

Picked into 8-13-stable, will go into 8.13.0-rc5.

Removed ~149423 label

Mentioned in commit 4265ba84