ICU-12811 Fix CI cache retain workflow's cron schedule string

diff --git a/.github/workflows/cache_retain.yml b/.github/workflows/cache_retain.yml
index 100ad02b8393a6448167c7d77165a8bf23bbf800..d8039efdce3d9ac88dd7946a97efc1681466b97e 100644 (file)
--- a/.github/workflows/cache_retain.yml
+++ b/.github/workflows/cache_retain.yml
@@ -24,7 +24,7 @@ on:
   schedule:
     # Because the Github Actions cache eviction policy is every 7 days,
     # this cron schedule is set to run every 6 days to ensure retention
-    - cron: '0 12 0/6 * *'
+    - cron: '0 12 */6 * *'
 
 jobs:
   retain-maven-cache: