Clean build an Arch Linux package inside a container

clean-build.sh

#!/bin/sh

set -o errexit

trap "docker rm --force lens-build" EXIT

docker pull archlinux

docker run \
  --detach \
  --name lens-build \
  archlinux \
  sleep infinity

docker exec -i lens-build bash <<-EOF
  set -o verbose

  pacman -Sy --noconfirm \
    base-devel \
    git \
    nodejs-lts-erbium \
    node-gyp \
    yarn

  useradd --create-home testuser
  echo "testuser ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/testuser
  su - testuser

  git clone https://aur.archlinux.org/lens.git
  cd lens
  makepkg -si --noconfirm
EOF