CERTBOT can't find config file in docker container - docker

Question

Two months ago, I set up a website with SSL thanks to Let's Encrypt. The details of how I did it are now quite blurry.
The site is hosted inside several docker containers (nginx, PHP, MySQL). There is a certbot container which should perform the renewal of the SSL certificate. This container is launched once a week and aborts immediately.
I have checked the logs and found this error. My research were unsuccessful and I have no idea what file certbot is complaining about.
usage:
certbot [SUBCOMMAND] [options] [-d DOMAIN] [-d DOMAIN] ...
Certbot can obtain and install HTTPS/TLS/SSL certificates. By default,
it will attempt to use a webserver both for obtaining and installing the
certificate.
certbot: error: Unable to open config file: certonly -n --webroot --webroot-path=/var/lib/challenge --email contact#**********.com --agree-tos --no-eff-email -d www.**********.com --key-type ecdsa. Error: No such file or directory
Do you have any idea of the problem?
Thanks in advance,
EDIT:
The contents of /etc/letsencrypt are
accounts archive cli.ini csr keys live renewal renewal-hooks
Inside cli.ini, I have :
key-type = ecdsa
elliptic-curve = secp384r1
rsa-key-size = 4096
email = contact#attom.eu
authenticator = webroot
webroot-path = /var/lib/challenge
agree-tos = true
The docker-compose.yml contains :
version: '3'
services:
nginx:
build: ./nginx
container_name: nginx
restart: unless-stopped
depends_on:
- php
networks:
- app-network
volumes:
- {{ mounted_dir_app }}/public:/var/www/html:ro
- certbotdata:/etc/letsencrypt:ro
- challenge:/home/challenge
ports:
- "80:80"
- "443:443"
env_file:
- .env
- ".env.$ENV"
healthcheck:
test: curl -IsLk $$SITE_URL | head -n 1 | grep -q -e ^HTTP -e 200
start_period: 30s
interval: 10s
timeout: 3s
retries: 5
php:
#skip
mysql:
#skip
certbot:
depends_on:
nginx:
condition: service_healthy
build:
context: ./certbot
args:
- "ENV=$ENV"
container_name: certbot
env_file:
- .env
- ".env.$ENV"
volumes:
- certbotdata:/etc/letsencrypt
- challenge:/var/lib/challenge
networks:
app-network:
driver: bridge
volumes:
dbdata:
certbotdata:
challenge:
Edit:
The CERTBOT Dockerfile is
ARG ENV
FROM certbot/certbot as cert-prod
CMD certonly -n --webroot --webroot-path=/var/lib/challenge --email contact#**********.com --agree-tos --no-eff-email -d www.**********.com --key-type ecdsa
FROM alpine as cert-dev
RUN apk update && apk add openssl
CMD mkdir -p /etc/letsencrypt/live/www.**********.com && \
openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
-subj "/C=**/ST=**********/L=**********" \
-keyout /etc/letsencrypt/live/www.**********.com/privkey.pem -out /etc/letsencrypt/live/www.**********.com/fullchain.pem
FROM cert-${ENV}