Add templates for "uptime-kuma"

[Matvey-Kuk]

Looks like nice OSS monitoring tool, do we need native support for alerts from it?

https://github.com/louislam/uptime-kuma

Btw native integrations are stored here: https://github.com/grafana/oncall/tree/dev/engine/config_integrations

If you use uptime-kuma and need templates, please let us know! 👇

[Matvey-Kuk]

Proposed to build this integration live in the community call: https://github.com/grafana/oncall/discussions/151

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 120 days.