Avoid failing when a job compression schedule is not set
Add a default compression
value so that rendering does not fail with
an exception when not set by the caller:
Error: Failed to render chart: exit status 1:
Error: UPGRADE FAILED: template: lava-server/templates/cronjob.yaml:11:14:
executing "lava-server/templates/cronjob.yaml"
at <.Values.compress.schedule>:
nil pointer evaluating interface {}.schedule