How to store uploaded files on the host when using Dockerfile/docker-compose

Hi,
I am using the following docker-compose.yaml to deploy my app, but could not figure out how to mount a volume for storing the uploaded files, because when checking the release folder i see ./lib/my-app-0.1.0/priv/static/uploads, any time the app version changes the path changes.
How to deal with this situation? or is there a better way?
Please help

version: '3.6'

services:
  db:
    image: "postgres:15-alpine"
    restart: always
    environment:
      POSTGRES_USER: xxx
      POSTGRES_PASSWORD: yyy
    volumes:
      - "~/.pgdata:/var/lib/postgresql/data"
    ports:
      - "5432:5432"

  app:
    build: 
      context: .
    ports:
      - 4000:4000
    depends_on:
      - db
    restart: always
    environment:
      DATABASE_URL: "ecto://xxxxx" 
      SECRET_KEY_BASE: "5hxxxxni"