Add wget

... so that Docker image creation can fetch dumb-init.

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

testing/docker/archlinux/Dockerfile

@@ -4,7 +4,7 @@ ARG CTNG_GID
 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
+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
 ENTRYPOINT [ "/sbin/dumb-init", "--" ]