Presets file as docker env?

[chojnicki]

I'm using imgproxy with docker compose. Configuring presets inline like this works:

- IMGPROXY_PRESETS=demo=resize:fill:192:192

But I need many presets, so external file would be better. Based on docks, we can use path:

imgproxy -presets /path/to/file/with/presets

So in docker compose I did it with volume:

    environment: 
      - IMGPROXY_PRESETS=/presets
    volumes:
      - ./docker/imgproxy/presets:/presets

But it does not work. I think that imgproxy is trying to understand this path in env as literal presets string. How can I configure it as a path?

FATAL [2023-03-14T09:54:54Z] Invalid preset string: /presets