Build/Test Tools: Fix the workflow that posts a preview link on every Pull Request

Fixes a 403 error in the pull-request-comments.yml job by switching from a custom workflow dispatch call to the pull_request_target trigger.

Follow up to [57124], [57174].
Props ockham.
See #59416.



git-svn-id: https://develop.svn.wordpress.org/trunk@57178 602fd350-edb4-49c9-b593-d223f7449a82

.github/workflows/pull-request-comments.yml

@@ -4,19 +4,14 @@ name: Pull Request Comments
 on:
   pull_request_target:
     types: [ 'opened' ]
-  workflow_dispatch:
-    inputs:
-      pr_number:
-        description: 'The pull request number to process.'
-        required: true
-        type: string
+    branches:
+      - trunk
 
 # Cancels all previous workflow runs for pull requests that have not completed.
 concurrency:
   # The concurrency group contains the workflow name and the branch name for pull requests
   # or the commit hash for any other events.
-  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request_target' && github.head_ref || github.event_name == 'workflow_dispatch' && inputs.pr_number || github.sha }}
-  cancel-in-progress: true
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request_target' && github.head_ref || github.event_name == 'workflow_dispatch' && github.event.number || github.sha }}
 
 # Disable permissions for all available scopes by default.
 # Any needed permissions should be configured at the job level.
@@ -31,7 +26,6 @@ jobs:
       pull-requests: write
     timeout-minutes: 5
     if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name == 'pull_request_target' }}
-
     steps:
       - uses: wow-actions/welcome@72817eb31cda1de60f51893d80e2e82ce57f7e76 # v1.3.0
         with:
@@ -87,7 +81,7 @@ jobs:
     permissions:
       issues: write
       pull-requests: write
-    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name == 'workflow_dispatch' }}
+    if: ${{ github.repository == 'WordPress/wordpress-develop' && github.event_name == 'pull_request_target' }}
     steps:
       - uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # v6.4.1
         with:
@@ -96,7 +90,7 @@ jobs:
             const commentInfo = {
               owner: context.repo.owner,
               repo: context.repo.repo,
-              issue_number: context.payload.inputs.pr_number
+              issue_number: ${{ github.event.number }}
             };
             const comments = ( await github.rest.issues.listComments( commentInfo ) ).data;
 
@@ -122,7 +116,7 @@ jobs:
 
             For more details about these limitations and more, check out the [Limitations page](https://wordpress.github.io/wordpress-playground/limitations/) in the WordPress Playground documentation.
 
-            [Test this pull request with WordPress Playground](https://playground.wordpress.net/wordpress.html?pr=${ context.payload.inputs.pr_number }).
+            [Test this pull request with WordPress Playground](https://playground.wordpress.net/wordpress.html?pr=${{ github.event.number }}).
             `;
 
             github.rest.issues.createComment( commentInfo );