Add Uptime-Kuma as new application for Civo marketplace

[dirsigler]

This issue is a:

• [ ] Bug Report
• [ ] Enhancement suggestion
• [X] Feature request

If the issue concerns an existing Marketplace application, please tag the maintainer of the application (found in manifest.yaml) below:

Enhancement suggestions / feature requests

If you are requesting an enhancement to a feature already present, or a new feature, please outline below the feature you would like to see, and how it would benefit you and the wider Civo Kubernetes userbase:

I would like to add the popular Uptime-Kuma as an additional application for the Civo Marketplace.