Fixes container lookup not being able to find a container running for specific image.

docker ps does not receive any more arguments and we have to filter by image ourselves

lib/kickstart-docker-ssh

@@ -3,7 +3,7 @@
 image_name=${1:-$KICKSTART_DOCKER_IMAGE}
 image_name=${image_name:-moul/sshd}
 
-runnig_sshd=$(docker ps -q "$image_name")
+runnig_sshd=$(docker ps --format='{{.ID}}\t{{.Image}}' | grep "$image_name" | cut -f 1)
 [ -z "$runnig_sshd" ] && echo "Docker container not created. Run \`kickstart docker-create\` to get one" && exit 1
 
 port=$(docker port "$runnig_sshd" 22 | cut -f 2 -d :)