Remove a static delay, delete comment while waiting for render

.github/workflows/preview_button.yml

@@ -6,6 +6,7 @@ on:
   pull_request:
   workflow_dispatch:
 
+
 permissions: read-all
 
 concurrency:
@@ -48,8 +49,11 @@ jobs:
             fi
           ) >> "$GITHUB_OUTPUT"
 
-      - name: Delay while the preview URL is built
-        run: "sleep ${{ steps.customvars.outputs.DELAY_SECONDS }}"
+      - name: Delete a comment
+        uses: thollander/actions-comment-pull-request@24bffb9b452ba05a4f3f77933840a6a841d1b32b # pin@v3
+        with:
+          comment-tag: button
+          mode: delete
 
       - name: Wait for site to render
         run: curl --retry-delay 10 --retry 18 --retry-all-errors -f -X HEAD -s -o /dev/null "${{ steps.customvars.outputs.BASE_URL }}${{ steps.customvars.outputs.URL_PATH }}"