Docker-based Ruby development environment

.dockerignore

.bundle
.git
.gitignore
.env*
!.env.example

docker-compose.yml

name: "example"

services:
  ruby:
    build:
      context: .
      args:
        - "RUBY_VERSION=${RUBY_VERSION:-2.7.8}"
        - "BUNDLER_VERSION=${BUNDLER_VERSION:-2.4.22}"
        - "UID=${UID:-1000}"
        - "GID=${GID:-1000}"
    command: "bundle exec jekyll serve --watch --host 0.0.0.0 --port 4000"
    restart: "unless-stopped"
    tty: true
    init: true
    env_file:
      - path: ".env"
        required: false
    ports:
      - "${FORWARD_APP_PORT:-4000}:4000"
    volumes:
      - ".:/app"
      - "/usr/local/bundle/gems"

Dockerfile

# syntax=docker/dockerfile:1.4

ARG DEBIAN_RELEASE="bookworm"
ARG RUBY_VERSION="3.3"

FROM ruby:${RUBY_VERSION}-slim-${DEBIAN_RELEASE}

LABEL maintainer="Daniel Weidner <[email protected]>"

LABEL org.label-schema.schema-version="1.0"
LABEL org.label-schema.name="ruby"
LABEL org.label-schema.description="Example Dockerfile to setup a ruby development environment with bundler"
LABEL org.label-schema.docker.cmd="docker run -d -v .:/app -v /usr/local/bundle/gems ruby bundle install"

ARG RUBY_VERSION
ARG BUNDLER_VERSION="2.5.6"
ARG UID=1000
ARG GID=1000

ENV RUBY_VERSION="${RUBY_VERSION}"
ENV BUNDLER_VERSION="${BUNDLER_VERSION}"

RUN <<-EOR
	set -e
	apt-get update
	apt-get install --yes --no-install-recommends build-essential=12.9
	apt-get clean
	rm -rf /var/lib/apt/lists/* use/share/doc /usr/share/man
	groupadd -g "${GID}" ruby
	useradd --create-home --no-log-init -u "${UID}" -g "${GID}" ruby
EOR

USER ruby
WORKDIR /app

COPY --link --chown=ruby:ruby Gemfile Gemfile.lock ./

RUN <<-EOR
	set -e
	gem install bundler -v "${BUNDLER_VERSION}"
	bundle check || bundle install
EOR

CMD ["irv"]