Fix PR labeling for fork contributions

.github/tests/test_label_pr_workflow.js

@@ -0,0 +1,19 @@
+// Copyright (c) Microsoft. All rights reserved.
+
+const { describe, it } = require('node:test');
+const assert = require('node:assert/strict');
+const { readFileSync } = require('node:fs');
+const { join } = require('node:path');
+
+const workflowPath = join(__dirname, '..', 'workflows', 'label-pr.yml');
+const workflow = readFileSync(workflowPath, 'utf8');
+
+describe('Label pull request workflow', () => {
+  it('uses the pull request token without the protected GitHub App environment', () => {
+    assert.match(workflow, /^on: \[pull_request_target\]$/m);
+    assert.doesNotMatch(workflow, /^\s+environment: github-app-auth$/m);
+    assert.match(workflow, /^\s+pull-requests: write$/m);
+    assert.doesNotMatch(workflow, /github-app-token/);
+    assert.match(workflow, /repo-token: \$\{\{ github\.token \}\}/);
+  });
+});

.github/workflows/label-pr.yml

@@ -11,36 +11,11 @@ on: [pull_request_target]
 jobs:
   add_label:
     runs-on: ubuntu-latest
-    environment: github-app-auth
     permissions:
       contents: read
-      id-token: write
+      pull-requests: write
 
     steps:
-      - name: Checkout GitHub automation
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-        with:
-          ref: ${{ github.event.pull_request.base.sha }}
-          sparse-checkout: .github/actions/github-app-token
-          fetch-depth: 1
-          persist-credentials: false
-
-      - name: Get GitHub automation token
-        id: github-auth
-        uses: ./.github/actions/github-app-token
-        with:
-          mode: ${{ vars.GH_APP_AUTH_MODE }}
-          azure-client-id: ${{ secrets.GH_APP_AZURE_CLIENT_ID }}
-          azure-tenant-id: ${{ secrets.GH_APP_AZURE_TENANT_ID }}
-          azure-subscription-id: ${{ secrets.GH_APP_AZURE_SUBSCRIPTION_ID }}
-          key-vault-name: ${{ secrets.GH_APP_KEY_VAULT_NAME }}
-          key-name: ${{ secrets.GH_APP_KEY_NAME }}
-          github-app-client-id: ${{ secrets.GH_APP_CLIENT_ID }}
-          github-app-installation-id: ${{ secrets.GH_APP_INSTALLATION_ID }}
-          repository: ${{ github.repository }}
-          permission-profile: pull-requests
-          fallback-token: ${{ secrets.GH_ACTIONS_PR_WRITE }}
-
       - uses: actions/labeler@b8dd2d9be0f68b860e7dae5dae7d772984eacd6d # v6.2.0
         with:
-          repo-token: ${{ steps.github-auth.outputs.token }}
+          repo-token: ${{ github.token }}