Update build.yml

Author: AtiusAmy

.github/workflows/build.yml

@@ -2,7 +2,7 @@ name: bluebuild
 on:
   schedule:
     - cron:
-        "00 06 * * *" # build at 06:00 UTC every day
+        "00 07 * * *" # build at 06:00 UTC every day
         # (20 minutes after last ublue images start building)
   push:
     paths-ignore: # don't rebuild if only documentation has changed