syz-cluster: fetch base kernels more often

Fetch and do build test of the base kernels 3 times per day instead
of 2.

Author: a-nogikh

syz-cluster/kernel-disk/fetch-kernels-cron.yaml

@@ -6,8 +6,8 @@ kind: CronWorkflow
 metadata:
   name: fetch-kernels-cron
 spec:
-  # Twice each day.
-  schedule: "0 */12 * * *"
+  # Three times per day.
+  schedule: "0 */8 * * *"
   concurrencyPolicy: "Replace"
   startingDeadlineSeconds: 0
   workflowSpec:

syz-cluster/workflow/rebuild-kernels-cron.yaml

@@ -11,8 +11,8 @@ kind: CronWorkflow
 metadata:
   name: rebuild-kernels-cron
 spec:
-  # Twice each day.
-  schedule: "30 */12 * * *"
+  # Three times per day.
+  schedule: "30 */8 * * *"
   concurrencyPolicy: "Replace"
   startingDeadlineSeconds: 0
   workflowSpec: