The flex Dockerfile for jemalloc ruby-2.6.6

Dockerfile

#fullstaq-ruby enables malloc-trim and jemalloc which is said to save up to 50% memory consumption
#ARG RUBY_VERSION=2.6.6-jemalloc
#FROM quay.io/evl.ms/fullstaq-ruby:${RUBY_VERSION}-slim

FROM swipesense/ruby-jemalloc:2.6-buster-slim
ENV LANG C.UTF-8
ENV DEBIAN_FRONTEND noninteractive

# Specify JP mirror, other mirrors are less stable than JP's
RUN echo 'deb http://ftp.jp.debian.org/debian/ buster main contrib non-free' > /etc/apt/sources.list
RUN echo 'deb http://ftp.jp.debian.org/debian/ buster-updates main contrib' >> /etc/apt/sources.list
RUN echo 'deb http://ftp.jp.debian.org/debian/ buster-backports main contrib non-free' >> /etc/apt/sources.list
RUN echo '#deb-src http://ftp.jp.debian.org/debian/ buster main contrib non-free' >> /etc/apt/sources.list
RUN echo '#deb-src http://ftp.jp.debian.org/debian/ buster-updates main contrib' >> /etc/apt/sources.list
RUN echo '#deb-src http://ftp.jp.debian.org/debian/ buster-backports main contrib non-free' >> /etc/apt/sources.list

RUN apt-get update -qq && apt-get install -y build-essential default-mysql-client imagemagick apt-transport-https curl apt-utils wget git
CMD /bin/bash

RUN mkdir /app
WORKDIR /app

# Install yarn
RUN curl -sL https://deb.nodesource.com/setup_10.x | bash -
RUN curl -sS https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
RUN echo "deb https://dl.yarnpkg.com/debian/ stable main" | tee /etc/apt/sources.list.d/yarn.list
RUN apt-get update -qq && apt-get install -y nodejs yarn
RUN gem uninstall bundler && gem install -N bundler

# Install GCP and cloud_sql_proxy
#RUN echo "deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list
#RUN curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key --keyring /usr/share/keyrings/cloud.google.gpg add -
#RUN apt-get update && apt-get install -y google-cloud-sdk
#RUN wget https://dl.google.com/cloudsql/cloud_sql_proxy.linux.amd64 -O /usr/local/bin/cloud_sql_proxy
#RUN chmod +x /usr/local/bin/cloud_sql_proxy
#RUN mkdir -p -m 777 /cloudsql