374 xyz tiles#377
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Introduces a new output option for the mosaic process, XYZ tilesets. This is still run from a backend management command. Initially I used
gdal2tiles.pycalling that script withsubprocess.run(), but instead I ended up with addingrio_tilerto the project and using utilities from that library to iterate the tile structure and write out tiles as PNGs. I've copied the core of that logic separately to this gist for later use.Closes #374
To support better background processing, this PR also adds configuration for a new celery worker that will run a separate queue for only mosaicking operations. This worker has
concurrency=1so that many mosaics (tilesets or COGs) can be queued without all running at once.Closes #106 (enough for now... though that ticket mentions a frontend affordance for starting the mosaic creation, and that will be handled in the next effort).