Allow setting up group runners in group CI/CD settings (#10244)

app/views/groups/runners/_group_runners.html.haml

+%h3 Group Runners
+
+.bs-callout.bs-callout-warning
+  GitLab Group Runners can execute code for all the projects in this group.
+  They can be managed using the #{link_to 'Runners API', help_page_path('api/runners.md')}.
+
+- if @group.runners.empty?
+  This group does not provide any group Runners yet.
+
+  - if can?(current_user, :admin_pipeline, @group)
+    = render partial: 'ci/runner/how_to_setup_runner',
+             locals: { registration_token: @group.runners_token, type: 'group' }
+  - else
+    Ask your group master to setup a group Runner.
+
+- else
+  %h4.underlined-title Available group Runners : #{@group.runners.count}
+  %ul.bordered-list
+    = render partial: 'groups/runners/runner', collection: @group.runners, as: :runner

app/views/groups/runners/_index.html.haml

+.light.prepend-top-default
+  %p
+    A 'Runner' is a process which runs a job.
+    You can setup as many Runners as you need.
+    %br
+    Runners can be placed on separate users, servers, and even on your local machine.
+
+  %p Each Runner can be in one of the following states:
+  %div
+    %ul
+      %li
+        %span.label.label-success active
+        \- Runner is active and can process any new jobs
+      %li
+        %span.label.label-danger paused
+        \- Runner is paused and will not receive any new jobs
+
+%hr
+
+%p.lead To start serving your jobs you can add Runners to your group
+.row
+  .col-sm-6
+    = render 'groups/runners/group_runners'

app/views/groups/runners/_runner.html.haml

+%li.runner{ id: dom_id(runner) }
+  %h4
+    = runner_status_icon(runner)
+
+  %span.commit-sha
+    = runner.short_sha
+
+  .pull-right
+    %small.light
+      \##{runner.id}
+  - if runner.description.present?
+    %p.runner-description
+      = runner.description
+  - if runner.tag_list.present?
+    %p
+      - runner.tag_list.sort.each do |tag|
+        %span.label.label-primary
+          = tag

app/views/groups/settings/ci_cd/show.html.haml

@@ -14,3 +14,14 @@
       = render "ci/variables/content"
   .settings-content
     = render 'ci/variables/index', save_endpoint: group_variables_path
+
+%section.settings.no-animate{ class: ('expanded' if expanded) }
+  .settings-header
+    %h4
+      Runners settings
+    %button.btn.js-settings-toggle
+      = expanded ? 'Collapse' : 'Expand'
+    %p
+      Register and see your runners for this group.
+  .settings-content
+    = render 'groups/runners/index'

app/views/projects/runners/_group_runners.html.haml

@@ -21,8 +21,8 @@
   This group does not provide any group Runners yet.
 
   - if can?(current_user, :admin_pipeline, @project.group)
-    = render partial: 'ci/runner/how_to_setup_runner',
-             locals: { registration_token: @project.group.runners_token, type: 'group' }
+    You can register group runners in the
+    = link_to 'Group CI/CD settings', group_settings_ci_cd_path(@project.group)
   - else
     Ask your group master to setup a group Runner.