Add comment with link to zip file.

.github/workflows/playground.yml

@@ -13,4 +13,4 @@ jobs:
         with:
           message: |
             ## WordPress Playground
-            You can easily [test this pull request on the WordPress Playground](https://playground.wordpress.net/#{"landingPage":"/wp-admin/","features":{"networking":true},"steps":[{"step":"defineWpConfigConsts","consts":{"IS_PLAYGROUND_PREVIEW":true}},{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://bypass-cors.altha.workers.dev/${{ github.server_url }}/${{ github.repository }}/archive/${{ github.sha }}.zip"},"options":{"activate":true}}]}).
+            You can easily [test this pull request on the WordPress Playground](https://playground.wordpress.net/#{"landingPage":"/wp-admin/","features":{"networking":true},"steps":[{"step":"defineWpConfigConsts","consts":{"IS_PLAYGROUND_PREVIEW":true}},{"step":"login","username":"admin","password":"password"},{"step":"installPlugin","pluginZipFile":{"resource":"url","url":"https://bypass-cors.altha.workers.dev/${{ github.server_url }}/${{ github.repository }}/archive/${{ github.sha }}.zip"},"options":{"activate":true}}]}), or [download the zip file](${{ github.server_url }}/${{ github.repository }}/archive/${{ github.sha }}.zip).