[MapProxy] Relative paths for existing source files (mbtiles)

[4 t]

Hello all,

is there a possibility to use releative paths also for existing tile
sources like MBTiles or geopackages?

What works is this:
cache:
type: geopackage
filename: D:\Kartendaten\meingeopackage.gpkg

What does not work is this:
cache:
type: geopackage
filename: './Kartendaten/meingeopackage.gpkg'

I did not find anything in the documentation. Only some options seem to be
configurable with relative paths.

many thanks in advance and greetings
David
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