Add confirmation for immediately starting scheduled jobs

app/assets/javascripts/pipelines/components/pipelines_actions.vue

 <script>
+import { s__, sprintf } from '~/locale';
 import { formatTime } from '~/lib/utils/datetime_utility';
 import eventHub from '../event_hub';
 import icon from '../../vue_shared/components/icon.vue';
@@ -23,10 +24,17 @@ export default {
     };
   },
   methods: {
-    onClickAction(endpoint) {
+    onClickAction(action) {
+      const confirmationMessage = sprintf(s__("DelayedJobs|Are you sure you want to run %{jobName} immediately? This job will run automatically after it's timer finishes."), { jobName: action.name });
+      // https://gitlab.com/gitlab-org/gitlab-ce/issues/52099
+      // eslint-disable-next-line no-alert
+      if (!window.confirm(confirmationMessage)) {
+        return;
+      }
+
       this.isLoading = true;
 
-      eventHub.$emit('postAction', endpoint);
+      eventHub.$emit('postAction', action.path);
     },
 
     isActionDisabled(action) {
@@ -77,7 +85,7 @@ export default {
           :disabled="isActionDisabled(action)"
           type="button"
           class="js-pipeline-action-link no-btn btn"
-          @click="onClickAction(action.path)"
+          @click="onClickAction(action)"
         >
           {{ action.name }}
           <span

app/views/projects/ci/builds/_build.html.haml

@@ -109,10 +109,12 @@
               title: job.scheduled_at }
               = sprite_icon('planning')
               = duration_in_numbers(job.execute_in, true)
+            - confirmation_message = s_("DelayedJobs|Are you sure you want to run %{job_name} immediately? This job will run automatically after it's timer finishes.") % { job_name: job.name }
             = link_to play_project_job_path(job.project, job, return_to: request.original_url),
               method: :post,
               title: s_('DelayedJobs|Start now'),
-              class: 'btn btn-default btn-build has-tooltip' do
+              class: 'btn btn-default btn-build has-tooltip',
+              data: { confirm: confirmation_message } do
               = sprite_icon('play')
             = link_to unschedule_project_job_path(job.project, job, return_to: request.original_url),
               method: :post,