Update docker-compose.yml

[Abhi5h3k]

Rule engine runner needs access to keys since workflow action definitions (Jinja templates) can reference secrets.

Using core.st2.IntervalTimer caused Error: "Failed to render parameter "passwords": [Errno 2] No such file or directory: '/etc/st2/keys/datastore_key.json'"

FIX for #discussion-6723256

Fixed:

Before Fix: