Static files are not loaded when served in a dockerized app with nginx

Question

I'm having problems with static files when served with nginx in my dockerized app.

Stack: Ruby + Hanami + Postgres + Puma + nginx

Static files: images, fonts, js files and css.

I wanted nginx to serve static files instead of Hanami. I have all static files ready in the hanami_project/public folder with this structure:

hanami_project/public
-general asset
-general asset 1

- hanami_app
  - hanami_app_assets

- hanami_app_2
  - hanami_app_2 assets

The hanami_project/public folder is a volume for the nginx service.

This is my docker_compose.yml:

version: '3'
services:
  postgres:
    image: postgres
    environment:
      - POSTGRES_USER=${POSTGRES_USER}
      - POSTGRES_PASSWORD=${POSTGRES_PASSWORD}
      - POSTGRES_DB=${POSTGRES_DB}
    ports:
      - 5432:5432
    volumes: 
      - postgres:/var/lib/postgresql/data

  web:
    build: .
    command: >
      bash -c "bundle exec hanami db migrate
      && bundle exec rake initial_settings:add_default_language
      && bundle exec rake initial_settings:add_session_validity
      && bundle exec rake import_user:create
      && bundle exec rake super_admin:create
      && bundle exec hanami assets precompile
      && bundle exec hanami server"
    expose:
      - 2300
    volumes:
      - ./hanami_log/hanami_app.log:/usr/src/app/hanami_log/hanami_app.log
    links:
      - postgres
    depends_on:
      - postgres

  nginx:
    image: nginx:alpine
    restart: unless-stopped
    tty: true
    ports:
      - "1337:80"
    volumes:
      - ./nginx.conf:/etc/nginx/nginx.conf
      - ./nginx_log:/var/log/nginx
      - ./public/assets:/www/static/assets
    depends_on:
      - web

volumes:
  postgres:
  web:
  nginx:

And here is my nginx.conf file:

user nginx;

events {}

http {

    upstream tsr {
        server web:2300;
    }

    server {
        listen 80;
        access_log /var/log/nginx/tsr.access.log;
        error_log  /var/log/nginx/tsr.error.log;

        location / {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;

            proxy_pass http://tsr;
            proxy_redirect off;

            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

        location /assets {
            root /www/static;
        }

        location /assets/hanami_app_2 {
            root /www/static;
        }
    }
}

EDIT1---

I've changed the root to alias like so:

location /assets/ {
            alias /www/static/assets/;
        }

        location /assets/hanami_app_2/ {
            alias /www/static/assets/hanami_app_2/;
        }

And the nginx logs return the file with 200:

"GET /assets/hanami_app_2/dataTables.fixedHeader.min-dfe62a6df19664362cdead540196ed66.js HTTP/1.1" 200 8148 "http://localhost:8091/hanami_app_2/login" 

However, the page is still stripped.

EDIT1---

As far as I can tell from nginx access and error logs this setup serves the files, but nothing gets loaded apart from images. By not being loaded I mean the entire page seems completely stripped with the exception of images.

Is there any way to pinpoint the issue?

Best, Sebastjan