Try/GitHub action playground comment

.github/workflows/pull-request-playground-comment.yml

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+# Leaves a comment on a pull request with a link to test the changes in a WordPress Playground instance.
+name: OPTIONAL - Comment on a pull request with Playground details
+
+on:
+    pull_request:
+        types: [opened, synchronize]
+# 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' && github.head_ref || github.sha }}
+    cancel-in-progress: true
+
+jobs:
+    test_using_wordpress_playground:
+        name: Test using WordPress Playground
+        runs-on: ubuntu-latest
+        permissions:
+            pull-requests: write
+        if: ${{ github.repository  == 'WordPress/gutenberg' || github.event_name == 'pull_request' }}
+        steps:
+            - name: Find Comment
+              uses: peter-evans/find-comment@v2
+              id: find-comment
+              with:
+                  issue-number: ${{ github.event.number }}
+                  comment-author: 'github-actions[bot]'
+                  body-includes: '<!-- pr-test-using=wordpress-playground -->'
+
+            - name: Create comment
+              if: steps.find-comment.outputs.comment-id == ''
+              uses: peter-evans/create-or-update-comment@v3
+              with:
+                  issue-number: ${{ github.event.number }}
+                  body: |
+                      <!-- pr-test-using=wordpress-playground -->
+                      ## Test this pull request with WordPress Playground
+
+                      | :arrow_forward: **[Click here to load this PR into WordPress Playground](https://playground.wordpress.net/gutenberg.html?pr=56964)** |
+                      | ------------- |
+
+                      > [!TIP]
+                      > _WordPress Playground uses the latest build of Gutenberg from this pull request. If your changes are not reflected in the Playground instance, it's likely that the most recent build isn't complete or has failed. Check the [build workflow runs to be sure](https://github.com/WordPress/gutenberg/actions/workflows/build-plugin-zip.yml)._
+
+                      ### About WordPress Playground
+
+                      [WordPress Playground](https://developer.wordpress.org/playground/) is an experimental project allows you to run a full WordPress instance entirely in the browser.
+
+                      #### Please note:
+                      - A fresh instance is created each time you open Playground in the browser.
+                      - **All changes will be lost** when refreshing the page or closing the window/tab running a Playground instance.
+                      - The Plugin and Theme Directories cannot be accessed within Playground.
+
+                      For more details about these limitations and more, check out [WordPress playground limitations](https://wordpress.github.io/wordpress-playground/limitations/) in the documentation.
+            - name: Update comment
+              if: steps.find-comment.outputs.comment-id != ''
+              uses: peter-evans/create-or-update-comment@v3
+              with:
+                  comment-id: ${{ steps.find-comment.outputs.comment-id }}
+                  issue-number: ${{ github.event.number }}
+                  edit-mode: replace
+                  body: |
+                      <!-- pr-test-using=wordpress-playground -->
+                      ## Test this pull request with WordPress Playground
+
+                      | :arrow_forward: **[Click here to load this PR into WordPress Playground](https://playground.wordpress.net/gutenberg.html?pr=56964)**  |
+                      | ------------- |
+
+                      > [!TIP]
+                      > _WordPress Playground uses the latest build of Gutenberg from this pull request. If your changes are not reflected in the Playground instance, it's likely that the most recent build isn't complete or has failed. Check the [build workflow runs to be sure](https://github.com/WordPress/gutenberg/actions/workflows/build-plugin-zip.yml)._
+
+                      ### About WordPress Playground
+
+                      [WordPress Playground](https://developer.wordpress.org/playground/) is an experimental project allows you to run a full WordPress instance entirely in the browser.
+
+                      #### Please note:
+                      - A fresh instance is created each time you open Playground in the browser.
+                      - **All changes will be lost** when refreshing the page or closing the window/tab running a Playground instance.
+                      - The Plugin and Theme Directories cannot be accessed within Playground.
+
+                      For more details about these limitations and more, check out [WordPress playground limitations](https://wordpress.github.io/wordpress-playground/limitations/) in the documentation.