How to set up nginx + docker + frontity?

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Hi сommunity Frontity I have a problem - I can’t install nginx along with frontity

My docker-compose.yml

version: '3.7'

services:
  sample:
    container_name: frontity_container
    build:
      context: .
      dockerfile: Dockerfile
    volumes:
      - '.:/app'
      - '/app/node_modules'
    ports:
      - 3000:3000
    environment:
      FRONTITY_URL: 'http://localhost'
      WP_URL: 'https://....'
  
  nginx:
    container_name: "nginx"
    build: ./nginx
    ports:
      - 80:80
    depends_on:
      - sample

My Dockerfile

FROM node:13.12.0-alpine

# set working directory
WORKDIR /app

ENV PATH /app/node_modules/.bin:$PATH

# install app dependencies
COPY package.json ./
COPY package-lock.json ./
RUN npm install

# add app
COPY . ./
RUN npx frontity build

RUN apk add --no-cache --upgrade bash

CMD ["npx", "frontity", "dev"]

My nginx.conf

server {
    listen 80;
    server_name localhost;

    location / {
        proxy_pass http://localhost:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }
}

Can you tell me where my mistake is or throw off the guide for running docker + nginx + frontity, I tried to repeat from this article (Deploy Frontity on NGINX Server) but my app is not running

Thank you in advance