Docker: PostgreSQL Django FATAL: password authentication failed for user "django" - django

Question

I'm trying to connect Django to the PostgreSQL server but still didn't manage to see what's the problem.
The docker container seems up and running correctly, but in Django, I get this error:
Pgdb throws me this error:
pgdb | 2021-06-09 23:49:00.871 UTC [35] FATAL: password authentication failed for user "django"
pgdb | 2021-06-09 23:49:00.871 UTC [35] DETAIL: Role "django" does not exist.
pgdb | Connection matched pg_hba.conf line 99: "host all all all md5"
Dockerfile
FROM python:3
ENV PYTHONUNBUFFERED=1
WORKDIR /usr/src/app
COPY requirements.txt ./
RUN pip3 install --upgrade pip
RUN pip3 install -r requirements.txt
docker-compose.yml
version: '3.8'
services:
django:
build: .
container_name: django
command: >
sh -c "python manage.py makemigrations &&
python manage.py runserver 0.0.0.0:8000"
volumes:
- .:/usr/src/app/
ports:
- '8000:8000'
environment:
DB_NAME: django
DB_USER: django
DB_HOST: pgdb
DB_PORT: 5432
DB_PASSWORD: django
CELERY_BROKER: redis://redis:6379/0
depends_on:
- pgdb
- redis
celery:
build: .
command: celery -A conf worker -l INFO
volumes:
- .:/usr/src/app/
depends_on:
- django
- redis
pgdb:
image: postgres
container_name: pgdb
environment:
POSTGRES_USER: django
POSTGRES_PASSWORD: django
ports:
- '5432:5432'
volumes:
- pgdata:/var/lib/postgresql/data/
redis:
image: 'redis:alpine'
volumes:
pgdata:
Django settings includes:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('DB_NAME'),
'USER': os.environ.get('DB_USER'),
'HOST': os.environ.get('DB_HOST'),
'PORT': os.environ.get('DB_PORT'),
'PASSWORD': os.environ.get('DB_PASSWORD'),
},
}
What's the problem? Am I missing something?