Adds docs for managing renovate schedule

.editorconfig

@@ -20,4 +20,3 @@ indent_size = unset
 [{Makefile,**.mk}]
 # Use tabs for indentation (Makefiles require tabs)
 indent_style = tab
-

renovate-bot.md

@@ -19,6 +19,18 @@ common_ci_tasks = {
 Note that if the `VAULT_SECRETS_PATH` configuration is present, this task will use Vault for resolution of `RENOVATE_GITLAB_TOKEN`.
+You can *optionally* set a schedule using cron format string eg.
+```terraform
+
+# Enable common-ci-task definitions
+common_ci_tasks = {
+    enabled      = true
+    renovate_bot = true
+    renovate_bot_schedule = "0 0 * * 2" # Every Tuesday at midnight UTC
+    ....
+}
+```
+
 ## Manual Setup
 For legacy project configurations, the following manual setup is required: