Dockerfile

FROM --platform=linux/x86_64 ubuntu:22.04

ENV DEBIAN_FRONTEND noninteractive

RUN ln -sf /usr/share/zoneinfo/Asia/Tokyo /etc/localtime
RUN \
  apt-get update && \
  apt-get upgrade -y && \
  apt-get -y install \
    ca-certificates curl sudo xorg dbus dbus-x11 ubuntu-gnome-default-settings gtk2-engines \
    fonts-freefont-ttf fonts-ubuntu-console fonts-droid-fallback lxappearance && \
  apt-get autoclean && \
  apt-get autoremove && \
  apt-get -y clean && \
  rm -rf /var/lib/apt/lists/* 

ENV GOSU_VERSION 1.17
RUN set -eux; \
  # save list of currently installed packages for later so we can clean up
    savedAptMark="$(apt-mark showmanual)"; \
    apt-get update; \
    apt-get install -y --no-install-recommends ca-certificates gnupg wget; \
    rm -rf /var/lib/apt/lists/*; \
    \
    dpkgArch="$(dpkg --print-architecture | awk -F- '{ print $NF }')"; \
    wget -O /usr/local/bin/gosu "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch"; \
    wget -O /usr/local/bin/gosu.asc "https://github.com/tianon/gosu/releases/download/$GOSU_VERSION/gosu-$dpkgArch.asc"; \
    \
  # verify the signature
    export GNUPGHOME="$(mktemp -d)"; \
    gpg --batch --keyserver hkps://keys.openpgp.org --recv-keys B42F6819007F00F88E364FD4036A9C25BF357DD4; \
    gpg --batch --verify /usr/local/bin/gosu.asc /usr/local/bin/gosu; \
    gpgconf --kill all; \
    rm -rf "$GNUPGHOME" /usr/local/bin/gosu.asc; \
    \
  # clean up fetch dependencies
    apt-mark auto '.*' > /dev/null; \
    [ -z "$savedAptMark" ] || apt-mark manual $savedAptMark; \
    apt-get purge -y --auto-remove -o APT::AutoRemove::RecommendsImportant=false; \
    \
    chmod +x /usr/local/bin/gosu; \
  # verify that the binary works
    gosu --version; \
    gosu nobody true