fix(github-actions): update merge status when target label changes

Currently when a PR is retargeted, the assistant to the branch manager
does not trigger an update.

github-actions/branch-manager/lib/main.ts

@@ -1,14 +1,17 @@
 import * as core from '@actions/core';
 import {context} from '@actions/github';
 import {Octokit} from '@octokit/rest';
-import {actionLabels} from '../../../ng-dev/pr/common/labels.js';
+import {actionLabels, mergeLabels, targetLabels} from '../../../ng-dev/pr/common/labels.js';
 import {revokeActiveInstallationToken, getAuthTokenFor, ANGULAR_ROBOT} from '../../utils.js';
 import {
   PullRequestLabeledEvent,
   PullRequestEvent,
   PushEvent,
 } from '@octokit/webhooks-definitions/schema.js';
 
+/** Set of target label names. */
+const targetLabelNames = new Set(Object.values(targetLabels).map((t) => t.name));
+
 async function run() {
   if (context.eventName === 'push') {
     const {ref} = context.payload as PushEvent;
@@ -50,7 +53,12 @@ async function run() {
 
     if (context.payload.action === 'labeled') {
       const event = context.payload as PullRequestLabeledEvent;
-      if (event.label.name === actionLabels.ACTION_MERGE.name) {
+      // If the merge label has been added, or if target labels have changed,
+      // another update of the merge status is needed.
+      if (
+        event.label.name === actionLabels.ACTION_MERGE.name ||
+        targetLabelNames.has(event.label.name)
+      ) {
         await createWorkflowForPullRequest();
       }
     }

github-actions/branch-manager/main.js

@@ -23509,6 +23509,7 @@ async function revokeActiveInstallationToken(githubOrToken) {
 }
 
 // 
+var targetLabelNames = new Set(Object.values(targetLabels).map((t) => t.name));
 async function run() {
   if (import_github2.context.eventName === "push") {
     const { ref } = import_github2.context.payload;
@@ -23535,7 +23536,7 @@ async function run() {
     }
     if (import_github2.context.payload.action === "labeled") {
       const event = import_github2.context.payload;
-      if (event.label.name === actionLabels.ACTION_MERGE.name) {
+      if (event.label.name === actionLabels.ACTION_MERGE.name || targetLabelNames.has(event.label.name)) {
         await createWorkflowForPullRequest();
       }
     }