Merge branch '9-add-registry-name-in-all-docker-images' into 'master'

Resolve "Add registry name in all Docker images"

Closes #9

See merge request to-be-continuous/tools/tracking!37

Dockerfile

-FROM busybox:1.36.0 AS busybox
+FROM registry.hub.docker.com/library/busybox:1.36.0 AS busybox
 
 FROM scratch