Wire up the scale action on the task group page

ui/app/controllers/jobs/job/task-group.js

@@ -54,4 +54,9 @@ export default class TaskGroupController extends Controller.extend(
   gotoAllocation(allocation) {
     this.transitionToRoute('allocations.allocation', allocation);
   }
+
+  @action
+  scaleTaskGroup(count) {
+    return this.model.scale(count);
+  }
 }

ui/app/templates/jobs/job/task-group.hbs

@@ -15,7 +15,8 @@
         @max={{model.scaling.max}}
         @value={{model.count}}
         @class="is-primary is-small"
-        @disabled={{or model.job.runningDeployment (cannot "scale job")}}>
+        @disabled={{or model.job.runningDeployment (cannot "scale job")}}
+        @onChange={{action "scaleTaskGroup"}}>
         Count
       </StepperInput>
       {{/if}}