gha: run scheduled jobs twice a day (#2120)

Author: ssbarnea

.github/workflows/ci.yaml

@@ -16,7 +16,7 @@ on:
     types: [synchronize, opened, reopened]
     branches: ["main", "devel/*"]
   schedule:
-    - cron: "0 0 * * *"
+    - cron: "0 0,12 * * *"
   workflow_dispatch:
     inputs:
       publish: