Nginx завершает работу с кодом состояния 127, но перед этим выводит: /bin/sh: python: не найден

Я создаю веб-приложение с помощью python, nginx и gunicorn. Команда docker-compose build работает нормально, но когда я запускаю собранный образ как контейнер, я получаю следующий результат:

root@ubuntuos:/home/eliot/Documents/development/python/projects/BarAPI/JustPub# docker-compose up
Creating network "justpub_default" with the default driver
Creating justpub_db_1 ... done
Creating justpub_web_1 ... done
Creating justpub_nginx_1 ... done
Attaching to justpub_db_1, justpub_web_1, justpub_nginx_1
nginx_1  | /bin/sh: python: not found
db_1     | 
db_1     | PostgreSQL Database directory appears to contain a database; Skipping initialization
db_1     | 
db_1     | 2022-06-19 14:08:35.192 UTC [1] LOG:  starting PostgreSQL 13.0 on x86_64-pc-linux-musl, compiled by gcc (Alpine 9.3.0) 9.3.0, 64-bit
db_1     | 2022-06-19 14:08:35.192 UTC [1] LOG:  listening on IPv4 address "0.0.0.0", port 5432
db_1     | 2022-06-19 14:08:35.192 UTC [1] LOG:  listening on IPv6 address "::", port 5432
db_1     | 2022-06-19 14:08:35.196 UTC [1] LOG:  listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
db_1     | 2022-06-19 14:08:35.200 UTC [22] LOG:  database system was shut down at 2022-06-19 14:08:26 UTC
db_1     | 2022-06-19 14:08:35.204 UTC [1] LOG:  database system is ready to accept connections
justpub_nginx_1 exited with code 127
web_1    | [2022-06-19 14:08:36 +0000] [1] [INFO] Starting gunicorn 20.1.0
web_1    | [2022-06-19 14:08:36 +0000] [1] [INFO] Listening at: http://0.0.0.0:8000 (1)
web_1    | [2022-06-19 14:08:36 +0000] [1] [INFO] Using worker: sync
web_1    | [2022-06-19 14:08:36 +0000] [8] [INFO] Booting worker with pid: 8

Как видите, nginx завершает работу сразу после запуска контейнера. Как решить эту проблему?

Main Dockerfile:

FROM python:3.9.5-alpine

WORKDIR /home/JustPub

ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1 .

COPY requirements.txt ./

RUN apk update && \
    apk add postgresql-dev gcc python3-dev musl-dev && \
    pip install --upgrade pip && \
    pip install -r ./requirements.txt

COPY . .

CMD gunicorn JustPub.wsgi:application -b 0.0.0.0:8000 --reload

docker-compose.yml:

version: '3.3'

services:
  web:
    build: ./
    volumes:
      - ./:/home/JustPub/
    ports:
      - "8000:8000"
    env_file:
      - .env-dev
    depends_on:
      - db

  nginx:
    build:
      context: ./nginx
      dockerfile: Dockerfile
    ports:
      - "80:80"
    depends_on:
      - web
      - db
    volumes:
      - ./static/:/static/

  db:
    image: postgres:13.0-alpine
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    environment:
      - POSTGRES_DB=justpub
      - POSTGRES_USER=eliot
      - POSTGRES_PASSWORD=justpub_password

volumes:
  postgres_data:

Nginx Dockerfile:

FROM nginx:1.22.0-alpine

RUN rm /etc/nginx/conf.d/default.conf
COPY ./nginx.conf /etc/nginx/conf.d

CMD python manage.py collectstatic --no-input

nginx.conf файл:

server {
    listen 80;

    location / {
        proxy_pass http://web:8000
    }

    location /static/ {
        alias /static/
    }
}

А структура моего проекта:

(venv) eliot@ubuntuos:~/Documents/development/python/projects/BarAPI$ tree -I "venv|__pycache__|migrations"

.
└── JustPub
    ├── backup.json
    ├── db.sqlite3
    ├── docker-compose.yml
    ├── Dockerfile
    ├── justpub
    ├── JustPub
    │   ├── asgi.py
    │   ├── __init__.py
    │   ├── settings.py
    │   ├── urls.py
    │   └── wsgi.py
    ├── manage.py
    ├── nginx
    │   ├── Dockerfile
    │   └── nginx.conf
    ├── Pub
    │   ├── admin
    │   │   ├── admin_forms.py
    │   │   └── __init__.py
    │   ├── apps.py
    │   ├── __init__.py
    │   ├── middleware.py
    │   ├── models.py
    │   ├── rest_api
    │   │   ├── __init__.py
    │   │   ├── serializers
    │   │   │   ├── base_serializer_mixin.py
    │   │   │   ├── category_serializers.py
    │   │   │   ├── dishes_serializers.py
    │   │   │   ├── dishestype_serializers.py
    │   │   │   └── __init__.py
    │   │   ├── templates
    │   │   │   ├── auth_and_logout
    │   │   │   │   ├── authentication.html
    │   │   │   │   └── logout.html
    │   │   │   ├── drf-yasg
    │   │   │   │   └── swagger-ui.html
    │   │   │   └── rest_framework
    │   │   │       └── api.html
    │   │   ├── urls
    │   │   │   ├── __init__.py
    │   │   │   └── pub_rest_endpoints.py
    │   │   └── views
    │   │       ├── docs_view.py
    │   │       ├── __init__.py
    │   │       ├── pub_viewsets.py
    │   │       └── user_auth_views.py
    │   └── urls.py
    ├── requirements.txt
    └── static

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