When I need to setup a PHP7 Symfony Docker container based on ArchLinux, I use this: https://bitbucket.org/mihaminarakotomandimby/archlinux-php7-symfony/src/master/
But these are some additional key points:
RUN echo 'Server = https://mirror.dogado.de/archlinux/$repo/os/$arch ' > /etc/pacman.d/mirrorlist RUN echo 'Server = https://mirrors.niyawe.de/archlinux/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://packages.oth-regensburg.de/archlinux/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://mirror.ubrco.de/archlinux/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://phinau.de/arch/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://ftp.halifax.rwth-aachen.de/archlinux/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://mirror.bethselamin.de/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://arch.jensgutermuth.de/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://mirror.gnomus.de/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://ftp.fau.de/archlinux/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist RUN echo 'Server = https://mirror.wtnet.de/arch/$repo/os/$arch ' >> /etc/pacman.d/mirrorlist
And also:
TBD