Add margin between buttons if both retry and cancel are present

app/assets/stylesheets/pages/pipelines.scss

@@ -128,6 +128,12 @@
       color: $table-text-gray;
     }
 
+    .cancel-retry-btns {
+      .btn:not(:first-child) {
+        margin-left: 8px;
+      }
+    }
+
     .dropdown-toggle,
     .dropdown-menu {
       color: $table-text-gray;

app/views/projects/ci/pipelines/_pipeline.html.haml

@@ -80,6 +80,7 @@
                     %span Download '#{build.name}' artifacts
 
       - if can?(current_user, :update_pipeline, @project)
+        .cancel-retry-btns
           - if pipeline.retryable?
             = link_to retry_namespace_project_pipeline_path(@project.namespace, @project, pipeline.id), class: 'btn has-tooltip', title: "Retry", method: :post do
               = icon("repeat")