[MapProxy] Y Axis issue

[Oliver Baadte]

I'm using Tilserver-GL to server tiles. In order to get a WMS, I want to use MapProxy to convert TMS to WMS. The Problem is that the Y axis seems to be reversed and any changes on SRS, GRID, ORIGIN etc. seem to be ignored. This is my MapProxy.YAML:

services:
      demo:
      tms:
        use_grid_names: true
        # origin for /tiles service
        origin: 'nw'
      kml:
          use_grid_names: true
      wmts:
      wms:
        md:
          title: MapProxy WMS Proxy
          abstract: This is a minimal MapProxy example.

    layers:
      - name: gisdb
        title: gisdb WMS
        sources: [gisdb_cache]

    caches:
      gisdb_cache:
        grids: [osm_grid]
        sources: [gisdb_tms]
        disable_storage: true

    sources:
      gisdb_tms:
        type: tile
        url: http://localhost:1234/styles/positron/%(z)s/%(x)s/%(y)s.png
        transparent: true

     grids:
        webmercator:
            base: GLOBAL_WEBMERCATOR
        osm_grid:
            base: GLOBAL_MERCATOR
            srs: 'EPSG:3857'
           origin: 'sw'
    globals:
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