docker-compose: how to see file-changes instantly (when developing)

I am new to docker, so this may seem very basic to you, anyway - its freaking me out at the moment.

I decided to develop a new web-project ontop of containers, of course i thought about docker. After finishing the tutorial and reading some Dockerfiles and so on, i decided to go with docker-compose.

I want to have multiple compose-files, one for Development, one for Production and so on. Now i managed to orchestrate a basic php/mysql/redis application using 3 different services. The main application is php based and maintained in the project src. Mysql and Redis are simply configured with base images and do not require any business logic.

I can build the containers and bring them up with

build:

docker-compose -f compose-Development.yml build

up:

docker-compose -f compose-Development.yml up

Many files in the main application container are built by gulp (templates, css, etc) and code will exist in both javascript and php.

I noticed, that my app state does not change when i change my files. I would have to rebuild and restart my containers.

Having some experience with Vagrant, i would go for some kind of shared source during development. But how would i achieve that?

My application Dockerfile (for development) looks like this:

FROM webdevops/php-nginx:7.1
COPY ./ /app
COPY docker/etc/ /opt/docker/etc

# php config...
RUN ln -sf /opt/docker/etc/php/php.Development.ini /opt/docker/etc/php/php.ini

WORKDIR /app/
EXPOSE 80

The compose file:

version: "3"
services:

  app:
    build:
      context: .
      dockerfile: Dockerfile.Development
    links:
      - mysql
      - redis
    volumes:
      - ./data/fileadmin:/app/public/fileadmin
      - ./data/uploads:/app/public/uploads
    env_file:
      - docker/env/All.yml
      - docker/env/Development.yml
    ports:
      - "80:80"
    restart: always

  # Mysql Container
  mysql:
    build:
      context: docker/mysql/
      dockerfile: Dockerfile
    restart: always
    volumes:
      - mysql:/var/lib/mysql
    env_file:
      - docker/env/All.yml
      - docker/env/Development.yml

  # Cache Backend Container
  redis:
    build:
      context: docker/redis/
      dockerfile: Dockerfile
    ports:
      - "6379:6379"
    volumes:
      - redis:/data
    env_file:
      - docker/env/All.yml
      - docker/env/Development.yml
    restart: always

volumes:
  mysql:
  redis:

So far, i used some github repositories to copy chunks from. I know there might be other problems in my setup as well, for the moment the most blocking issue is the thing with the linked/copied source.

Kind regards, Philipp