client: archlinux: re-install system base dependencies

in order to capture their respective man pages.

client/Dockerfiles/remote/docker-finance/finance/Dockerfile.archlinux

@@ -37,6 +37,16 @@ RUN pacman -Syu --noconfirm --disable-download-timeout
 # NOTE: must be applied here before installing any other packages (that have man pages)
 RUN sed -i '/NoExtract  = usr\/share\/man\/\* usr\/share\/info\/\*/d' /etc/pacman.conf
 
+# System packages
+# NOTE: although these are already default-installed in the upstream image,
+# they're re-installed here in order to capture their respective man pages.
+RUN pacman -Syu \
+  bash \
+  coreutils \
+  gawk \
+  sed \
+  --noconfirm --disable-download-timeout
+
 # Base packages
 RUN pacman -Syu \
   bc \