Fix building archlinux image

`groupadd` now requires libaudit.so, but coreutils can be installed
without audit package. Weird, gross.

Signed-off-by: Alexey Neyman <stilor@att.net>

testing/docker/archlinux/Dockerfile

@@ -1,10 +1,10 @@
 FROM base/archlinux:latest
 ARG CTNG_UID
 ARG CTNG_GID
+RUN pacman -Syu --noconfirm
+RUN pacman -S --noconfirm base-devel git help2man python unzip wget audit
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
-RUN pacman -Syu --noconfirm
-RUN pacman -S --noconfirm base-devel git help2man python unzip wget
 RUN wget -O /sbin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64
 RUN chmod a+x /sbin/dumb-init
 RUN echo 'export PATH=/opt/ctng/bin:$PATH' >> /etc/profile