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    David Kimura PRO said over 4 years ago on In Depth with Docker Compose :
    If anyone is wanting to use an Alpine version of a Ruby image, here's what I'm using. I've included some commented out lines which you can replace the postgresql-dev with the sqlite or mysql (mariadb) depending on the database you're using.

    FROM ruby:2.6.6-alpine3.12
LABEL MAINTAINER=dave@k-innovations.net

# sqlite-dev \
# mariadb-dev \
RUN apk add --no-cache --update build-base \
  git \
  postgresql-dev \
  nodejs \
  yarn \
  tzdata \
  && rm -rf /var/cache/apk/*

RUN bundle config --global frozen 1

COPY Gemfile Gemfile.lock ./
RUN gem update --system
RUN gem install bundler
RUN bundle install -j $(nproc)

RUN mkdir -p /app
WORKDIR /app

    This helped reduce the base image from 2GB to 1GB.
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