Add description to slack notification for new theme release (#847)

feat: Add description to slack notification for new theme release

Author: lamATnginx

.github/workflows/build-push.yml

@@ -101,6 +101,11 @@ jobs:
                     value: `${{ github.event.client_payload.author }}`,
                     short: true
                   },
+                  {
+                    tilte: 'Description',
+                    value: `${{ github.event.client_payload.description }}`,
+                    short: false
+                  },
                   {
                     title: 'Preview URL',
                     value: `${{ env.PREVIEW_URL }}`,