- Cleaner image listing in docker-update.

- The version of shellcheck is TravisCI is older and ignores the disable
decleration, use xargs instead shell command substition.

Documents/Shore/cleanup/docker-clean

 #!/bin/sh
-# shellcheck disable=SC2046
+# Deliberately don't set -e, allow failures to continue silently.
 set -u
-docker rm $(docker ps --quiet --filter=status=exited) 2>/dev/null
-docker rm $(docker ps --quiet --filter=status=created) 2>/dev/null
-docker rmi $(docker images --quiet --filter=dangling=true) 2>/dev/null
-docker volume rm $(docker volume ls --quiet --filter=dangling=true) 2>/dev/null
+
+docker ps --quiet --filter=status=exited | xargs -r docker rm --volumes 2>/dev/null
+docker ps --quiet --filter=status=created | xargs -r docker rm --volumes 2>/dev/null
+docker images --quiet --filter=dangling=true | xargs -r docker rmi 2>/dev/null
+docker volume ls --quiet --filter=dangling=true | xargs -r docker volume rm 2>/dev/null

Documents/Shore/cleanup/docker-update

 #!/bin/sh
 set -eu
-for image in $(docker images | awk '$1!="<none>" && NR>1 {printf("%s:%s\n", $1, $2)}')
+for image in $(docker images --format '{{.Repository}}:{{.Tag}}')
 do
     docker pull "$image" || echo "Skipping..."
 done