<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Chores**
- Updated the source URL for Docker Compose file download in the cloud
initialization script to a specific GitHub repository for improved
reliability and traceability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
We're `watchtower:latest-dev` image for the `--schedule` support. This
was only available in the `latest-dev` version of Watchtower.
Now, this feature is available in the `latest` version of Watchtower, so
we should be fine switching back to `latest`.
More importantly, the `latest-dev` version of Watchtower, doesn't have
ARM images built. It only has AMD images built today. So this watchtower
service fails to start on ARM architectures. This PR fixes that.
