Add support for Custom Tile Maps

[gaby]

Which OpenObserve functionalities are relevant/related to the feature request?

dashboards

Description

Currently OpenObserve only supports OpenStreetMaps, mostly because the URL is hardcoded in the UI. There a lot of different tile map providers that could be used by the user. You can also host your own tile-map to reduce network i/o.

Proposed solution

Add two new ENV variables that allows specifying:

• map tilemap url
• map tilemap attribution

By default it should use the current:

• https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png
• &copy; <a href="https://www.openstreetmap.org/copyright">OpenStreetMap</a> contributors

These are defined here: https://github.com/openobserve/openobserve/blob/main/web/src/components/dashboards/panels/GeoMapRenderer.vue#L94

Alternatives considered

N/a