Dockerfile for Rails with devcontainer support

Dockerfile

# *****************************************************************************
# * Base image based on offical ruby alpine image with minimal dependencies.  *
# *****************************************************************************
FROM ruby:3.1.0-alpine as base

RUN apk add --update --no-cache ca-certificates gcompat libpq tzdata

# *****************************************************************************
# * Builder image with all dependencies installed.                            *
# *****************************************************************************
FROM base as builder

ARG GITHUB_PACKAGES_TOKEN
ENV BUNDLE_RUBYGEMS__PKG__GITHUB__COM ${GITHUB_PACKAGES_TOKEN}
ENV NODE_AUTH_TOKEN ${GITHUB_PACKAGES_TOKEN}

RUN apk add --update --no-cache \
        build-base \
        curl \
        git \
        graphicsmagick \
        libffi-dev \
        libsodium-dev \
        libxml2-dev \
        libxslt-dev \
        nodejs \
        openssh-client \
        postgresql-dev \
        yarn

# *****************************************************************************
# * DevContainer image based on builder with scripts to setup dev environment *
# *   Reference: https://github.com/microsoft/vscode-dev-containers           *
# *****************************************************************************
FROM builder as devcontainer

ARG SCRIPT_LIBRARY_VERSION=0.210.0
ARG INSTALL_ZSH="true"

# Install needed packages and setup non-root user. Use a separate RUN statement to add your own dependencies.
ARG USERNAME=vscode
ARG USER_UID=1000
ARG USER_GID=$USER_UID

ADD https://raw.githubusercontent.com/microsoft/vscode-dev-containers/v${SCRIPT_LIBRARY_VERSION}/script-library/common-alpine.sh /tmp/library-scripts/
RUN apk update && ash /tmp/library-scripts/common-alpine.sh "${INSTALL_ZSH}" "${USERNAME}" "${USER_UID}" "${USER_GID}" \
    && rm -rf /tmp/library-scripts

# Default value to allow debug server to serve content over GitHub Codespace's port forwarding service
# The value is a comma-separated list of allowed domains
ENV RAILS_DEVELOPMENT_HOSTS=".githubpreview.dev,.test"

# *****************************************************************************
# * PreProd image based on builder to build production image              *
# *****************************************************************************
FROM builder as pre-prod

ENV RAILS_ENV production
ENV SECRET_KEY_BASE fake-secret-key-base

RUN mkdir -p /app
WORKDIR /app

COPY Gemfile Gemfile.lock /app/
RUN bundle config --global frozen 1 \
    && bundle config set --local without 'development test' \
    && bundle install -j4 --retry 3 \
    && rm -rf /usr/local/bundle/bundler/gems/*/.git /usr/local/bundle/cache/

COPY package.json yarn.lock .yarnrc .npmrc /app/
RUN yarn install

COPY . /app/
RUN bundle exec rails assets:precompile

# *****************************************************************************
# * Prod image is the production image w/o dev dependencies and node_modules  *
# *****************************************************************************
FROM base as prod

ENV RAILS_ENV production
ENV RAILS_SERVE_STATIC_FILES true
ENV RAILS_LOG_TO_STDOUT true

RUN mkdir -p /app
WORKDIR /app

COPY --from=pre-prod /usr/local/bundle/ /usr/local/bundle/
COPY --from=pre-prod /app/ /app/

CMD ["bundle", "exec", "rails", "server", "-b", "0.0.0.0"]