fix: Remove old untagged Docker images #63

Job	Run time
delete-untagged-images	25s
build-and-push-image (./docker_foxy_desktop/Dockerfile, ./docker_foxy_desktop, gazebo_nvidia, fox...	2m 40s
build-and-push-image (./docker_foxy_desktop/Dockerfile, ./docker_foxy_desktop, xplore_common, fox...	2m 39s
build-and-push-image (./docker_humble_desktop/Dockerfile, ./docker_humble_desktop, gazebo_nvidia,...	5m 33s
build-and-push-image (./docker_humble_desktop/Dockerfile, ./docker_humble_desktop, xplore_common,...	4m 13s
build-and-push-image (./docker_foxy_jetson/Dockerfile, ./docker_foxy_jetson, gazebo_nvidia, foxy-...	2m 30s
build-and-push-image (./docker_humble_jetson/Dockerfile, ./docker_humble_jetson, gazebo_nvidia, h...	2m 44s
	20m 44s

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