feat(ci): support merge queues (#509)

### Briefly, what does this PR introduce?
This adds the ability to use merge queues in epic.

### What kind of change does this PR introduce?
- [ ] Bug fix (issue #__)
- [x] New feature (issue #__)
- [ ] Documentation update
- [ ] Other: __

### Please check if this PR fulfills the following:
- [ ] Tests for the changes have been added
- [ ] Documentation has been added / updated
- [ ] Changes have been communicated to collaborators

### Does this PR introduce breaking changes? What changes might users
need to make to their code?
No

### Does this PR change default behavior?
No.

.github/workflows/linux-eic-shell.yml

@@ -7,6 +7,7 @@ on:
     tags:
       - '*'
   pull_request:
+  merge_group:
   workflow_dispatch:
     inputs:
       github_repository: