Use pacman.conf from devtools

Makefile

 rootfs:
 	$(eval TMPDIR := $(shell mktemp -d))
-	pacstrap -C rootfs/etc/pacman.conf -c -d -G -M $(TMPDIR) $(shell cat packages)
+	pacstrap -C /usr/share/devtools/pacman-extra.conf -c -d -G -M $(TMPDIR) $(shell cat packages)
 	cp -rvp --backup --suffix=.pacnew rootfs/* $(TMPDIR)/
 	arch-chroot $(TMPDIR) locale-gen
 	arch-chroot $(TMPDIR) pacman-key --init

README.md

@@ -2,7 +2,7 @@
 This repository contains all scripts and files needed to crate a Docker base image for the Arch Linux distribution.
 ## Dependencies
 Install the following Arch Linux packages:
-* arch-install-scripts
 * make
+* devtools
 ## Usage
 Run `make docker-image` as root to build the base image.

rootfs/etc/pacman.conf

-[options]
-Architecture = auto
-SigLevel = Required DatabaseOptional
-LocalFileSigLevel = Optional
-
-[core]
-Include = /etc/pacman.d/mirrorlist
-
-[extra]
-Include = /etc/pacman.d/mirrorlist
-
-[community]
-Include = /etc/pacman.d/mirrorlist