Update '.gitea/workflows/demo.yaml'

.gitea/workflows/demo.yaml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     container: 
       image: catthehacker/ubuntu:act-latest
-      valid_volumes:
+      valid_volume:
         - /run/user/1000/docker.sock
       options: '-e DOCKER_HOST=unix:///run/user/1000/docker.sock -v /run/user/1000/docker.sock:/run/user/1000/docker.sock'
     steps: