fixed yaml structure and shortened name (#25)

Author: backstreetkiwi

template/.github/workflows/publish_main_artifacts.yml.j2

@@ -2,13 +2,13 @@
 # This file is automatically generated from the templates in stackabletech/operator-templating
 # DON'T MANUALLY EDIT THIS FILE
 # =============
-name: Publish Artifacts from the main branch to the dev repository.
+name: Publish nightly artifacts from main
 
 on:
  push:
  branches:
  - main
-  schedule:
+ schedule:
  - cron: '30 4 * * *'
  workflow_dispatch: