Dockerfile

################
# BASE
FROM ruby:3.0.3-slim AS base

WORKDIR /app
ENV RAILS_ENV production
ENV BUNDLE_DEPLOYMENT true
ENV BUNDLE_PATH vendor/bundle
ENV BUNDLE_WITHOUT development:test

# Install bundler
RUN gem install bundler --no-document

# Setup apt
RUN apt-get update

################
# BUILDER BASE
FROM base AS builder

# Install build tools
RUN apt-get install -y \
      autoconf \
      build-essential \
      git

################
# BUNDLE
FROM builder AS bundle

# Install libs
RUN apt-get install -y \
      libsqlite3-dev

COPY Gemfile Gemfile.lock .
RUN bundle install -j 4 \
      && rm -rf $BUNDLE_PATH/ruby/$RUBY_VERSION/cache/*

#################
## YARN
#FROM builder AS yarn
#
## Install nodejs(LTS)
#RUN curl -fsSL https://deb.nodesource.com/setup_lts.x | bash - \
#      && apt-get install -y nodejs
#
## Install yarn
#RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add - \
#      && echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list \
#      && apt update \
#      && apt install -y yarn
#
## Install npm packages
#COPY package.json yarn.lock .
#RUN yarn install \
#      && yarn cache clean

################
# ASSETS
FROM builder AS assets

COPY . .

COPY --from=bundle /app/vendor/bundle /app/vendor/bundle
#COPY --from=yarn /app/node_modules node_modules

# Set a dummy value to avoid errors when building docker image.
# refs: https://github.com/rails/rails/issues/32947
RUN SECRET_KEY_BASE=dummy bin/rails assets:precompile \
      && rm -rf tmp/cache/*

################
# MAIN
FROM base

# Install packages
RUN apt-get install -y \
      imagemagick \
      sqlite3 \
      && apt-get clean \
      && rm -rf /var/lib/apt/lists/*

# Install the Runtime Interface Client
RUN gem install --no-document aws_lambda_ric

# Copy files
COPY . .
COPY --from=bundle /app/vendor/bundle /app/vendor/bundle
#COPY --from=assets /app/public/assets /app/public/assets
#COPY --from=assets /app/public/packs /app/public/packs

ENTRYPOINT ["/usr/local/bundle/bin/aws_lambda_ric"]
CMD ["app.handler"]