build live demo only from main

Author: ivictbor

live-demo/deploy/.woodpecker.yml

@@ -40,10 +40,10 @@ steps:
       - export $(cat /woodpecker/deploy.vault.env | xargs)
       - cd live-demo/deploy && /bin/sh buildSlackNotify.sh
 
-
   build-live-demo:
     when:
       - event: push
+        branch: main
     image: docker
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock