Adds a cronjob to restart EOTK once a week to avoid any existing issues with long-lived Onion Services.
Uses the instance index as the day of the week in the cronjob.
See discussion at https://gitlab.torproject.org/tpo/onion-services/onion-support/-/issues/192
I haven't tested it beyond the syntax as currently I don't have access to a proper testing environment.
I'm also very new into Terraform.