How to update docker volume from inside a container? - docker

Question

I have two docker containers connected through a frontendbuild docker volume:
services:
nginx:
container_name: nginx
build:
context: .
dockerfile: ./compose/production/nginx_ssltls/Dockerfile
#restart: unless-stopped
volumes:
- ./compose/production/nginx_live:/etc/nginx/conf.d
- ./data/certbot/conf:/etc/letsencrypt
- ./data/certbot/www:/var/www/certbot
- staticfiles_harcelement:/app/static
- mediafiles_harcelement:/app/media
- frontendbuild:/usr/share/nginx/html/build
ports:
- "80:80"
- "443:443"
command: "/bin/sh -c 'while :; do sleep 6h & wait $${!}; nginx -s reload; done & nginx -g \"daemon off;\"'"
networks:
- network_app
react
build:
context: .
dockerfile: ./compose/production/frontend/Dockerfile
#restart: always
volumes:
- frontendbuild:/app/frontend/build
networks:
- network_app
Each time i re-run my build, the volume is not updated with the updated /app/frontend/build folder from the updated react docker container.
I have found how to update a volume from a folder on my host machine, but this time the build is created in the Dockerfile, so the files I need to update to the volume are inside the container...
How can i automatize this in code?
Here is result of docker inspect volume :
[
{
"CreatedAt": "2022-07-07T19:37:23+02:00",
"Driver": "local",
"Labels": {
"com.docker.compose.project": "app-harcelement",
"com.docker.compose.version": "1.25.0",
"com.docker.compose.volume": "frontendbuild"
},
"Mountpoint": "/var/lib/docker/volumes/frontendbuild/_data",
"Name": "frontendbuild",
"Options": null,
"Scope": "local"
}
]
Thank you