Add image puller helper separate of apply script.

scripts/pull_containers.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+mapfile -t AVAILABLE_IMAGES < <(run show container image | awk '{ if ( NR > 1  ) { print $1 ":" $2} }')
+mapfile -t CONFIG_IMAGES < <(find /config/config-parts/ -type f -exec sed -nr "s/set container name .* image '(.*)'/\1/p" {} + | sort | uniq)
+
+for image in "${CONFIG_IMAGES[@]}"; do
+if [[ ! " ${AVAILABLE_IMAGES[*]} " =~ \ ${image}\  ]]; then
+    echo "Pulling image ${image}"
+    podman pull image "${image}"
+fi
+done