Allow application developers to directly download the output tilesets to facilitate easier self-hosting

[antonmarsden]

User Story

In order to build a high traffic map-based application (web/mobile) that uses LINZ tiles, as an application developer I want to be able to self-host the Web Mercator output tilesets on my own infrastructure. (instead of trying to figure out how to build the outputs from this GitHub repo).

I'm sure there could be use cases where developers may want to customise the output, but I suspect most will be happy to consume what you're currently producing.

Acceptance Criteria

• [ ] Can conveniently get access to the download the output tileset as a single large file, e.g., a pmtiles file (the pmtiles format can bundle both vector and raster tiles). For reference, see this publically available repository containing OSM vector data in pmtiles format
• [ ] If not pmtiles format, would be useful to have documentation regarding how to do format shifting.
• [ ] ...

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