Docker file update volume - docker

Question

Hello I have a project in elixir, but I have doubts about how I can make a link whenever I update my files locally update the docker,
so you don't have to use docker-compose up every time something is updated.
my docker file :
FROM elixir:alpine
RUN apk add --update --no-cache curl py-pip
RUN apk add --no-cache build-base git
WORKDIR /app
RUN mix local.hex --force && \
mix local.rebar --force
COPY mix.exs mix.lock ./
COPY config config
RUN mix do deps.get, deps.compile
COPY priv priv
COPY lib lib
COPY numbers.csv numbers.csv
COPY docker-entrypoint.sh docker-entrypoint.sh
EXPOSE 4000
docker-compose:
version: "3.7"
services:
app:
restart: on-failure
build: .
command: /bin/sh docker-entrypoint.sh
ports:
- "4000:4000"
depends_on:
- postgres-db
links:
- postgres-db
env_file:
- .env
postgres-db:
image: "postgres:12"
restart: always
container_name: "postgres-db"
environment:
POSTGRES_PASSWORD: ${DB_PASS}
POSTGRES_USER: ${DB_USER}
POSTGRES_DB: ${DB_NAME}
ports:
- "5432:5432"
folder structure:

Answer 1

You should have another docker-compose file called docker-compose.override.yml which is your setup for local development. In that file, you can use volumes to get local file updates being reflected in the docker container (while it's running):
It will look something like this (look at the volumes part):
version: "3.8"
services:
db:
image: postgres:13.0
env_file:
- ./docker/dev.env
restart: always
ports:
- "5432:5432"
volumes:
- db-data:/var/lib/postgresql/data
spiritpay:
image: spiritpay:local
build:
context: .
dockerfile: ./Dockerfile
depends_on:
- db
stdin_open: true
tty: true
env_file:
- ./docker/dev.env
ports:
- "4000:4000"
- "4002:4002"
volumes:
- /opt/spiritpay/assets/node_modules
- ./assets:/opt/spiritpay/assets
- ./config:/opt/spiritpay/config:ro
- ./lib:/opt/spiritpay/lib:ro
- ./priv:/opt/spiritpay/priv
- ./test:/opt/spiritpay/test:ro
- ./mix.exs:/opt/spiritpay/mix.exs:ro
- ./mix.lock:/opt/spiritpay/mix.lock:ro
volumes:
db-data: