Update sync.yml

Author: zen0bit

.github/workflows/sync.yml

@@ -1,13 +1,13 @@
 # .github/workflows/sync.yml
 name: Rebase Upstream
 on:
-  schedule:
-    - cron: '0 */6 * * *' # Run every 6 hours
+  # schedule:
+    # - cron: '0 */6 * * *' # Run every 6 hours
   workflow_dispatch:   # run manually
 
 jobs:
   sync:
-    runs-on: alpine-latest
+    runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@master
       with: