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Help: how to get / update files from gitlab repository into docker volume in production

Hello,

i am using docker quite a bit for php development on my local machine and it works like a charm.

my docker compose for development:

version: "3.5"
services:
  webserver:
   image: php:7.4-apache
   container_name: dev-webserver
  volumes: 
    - ./src:/var/www/html
  environment: 
    - VIRTUAL_PORT=8080
    - VIRTUAL_HOST=webserver.dev

i cloned my project from gitlab into the src folder and develop in there.

in the docker documentation it says I should use volumes in production not bind mounts.

  volumes: 
    - src:/var/www/html

but how does my application get into this volume? Should I create a custom Dockerfile and git clone from there into the volume?

How do I update / pull from my repository into the containers volumes?

Thank you!