Pull images included within compose service definitions prior to terr…

…aform

Ensure all images included within constructed `docker-compose` command
are pulled in parallel prior to stand-up.

[OF6-1396]

bin/dock

@@ -714,6 +714,16 @@ terraform_container() {
       docker-compose config > ${tmp_workspace}/$output_file"
     compose_args+=("--file" "$output_file")
   done
+
+  # Download all images included within compose service definitions in parallel
+  pull_args=("${compose_args[@]}")
+  pull_args+=("pull" "--parallel")
+  if quiet; then
+      pull_args+=("--quiet")
+  fi
+  pull_cmd="${pull_args[@]}"
+  docker exec $container_name "$pull_cmd"
+
   # Only start services which have been defined as startup services by composed
   # projects
   local services="$(get_label_value $container_name startup_services)"