fix(ng-dev): allow for temporarily disabling workflows

ng-dev/perf/workflow/loader.ts

@@ -2,13 +2,32 @@ import {readFile} from 'fs/promises';
 import {parse} from 'yaml';
 
 export interface Workflow {
+  // The friendly name of the workflow.
   name: string;
+  // The set of commands to run under timing test for the workflow.
   workflow: string[];
+  // The set of commands to run in preparation for the workflow.
   prepare?: string[];
+  // The set of commands to run as a cleanup.
   cleanup?: string[];
+  // Whether the workflow is temporarily disabled.
+  disabled?: true;
 }
 
 export async function loadWorkflows(src: string) {
+  /** The set of workflows which can be executed. */
+  const filteredWorkflows: {[key: string]: Workflow} = {};
+  /** The workflow configuration file content as a string.  */
   const rawWorkflows = await readFile(src, {encoding: 'utf-8'});
-  return parse(rawWorkflows).workflows as {[key: string]: Workflow};
+  /** The object parsed from the workflow configuration file, holding the workflow configurations. */
+  const workflows = parse(rawWorkflows).workflows as {[key: string]: Workflow};
+
+  // Remove any workflow which is marked as disabled.
+  for (const [name, workflow] of Object.entries(workflows)) {
+    if (workflow.disabled !== true) {
+      filteredWorkflows[name] = workflow;
+    }
+  }
+
+  return filteredWorkflows;
 }