Merge branch 'fix-404-for-pipelines' into 'master'

Fix 404 for pipelines

## What does this MR do?
Allow to access pipelines of public project by logged guest.

## What are the relevant issue numbers?
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17885

## Does this MR meet the acceptance criteria?

- [ ] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [ ] All builds are passing
- [ ] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [ ] Branch has no merge conflicts with `master` (if you do - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !4881

1 files changed, 2 insertions, 1 deletions

diff --git a/app/models/ability.rb b/app/models/ability.rb
index 9c58b956007..f5950879ccb 100644
--- a/app/models/ability.rb
+++ b/app/models/ability.rb
@@ -196,7 +196,8 @@ class Ability
       @public_project_rules ||= project_guest_rules + [
         :download_code,
         :fork_project,
-        :read_commit_status
+        :read_commit_status,
+        :read_pipeline
       ]
     end