Add the dockerfiles and the makefile to .dockerignore, so they don't take space on the image or invalidate the cache.
Add the dockerfiles and the makefile to .dockerignore, so they don't take space on the image or invalidate the cache.

deviceMP/resin-supervisor,deviceMP/resin-supervisor,nghiant2710/resin-supervisor,resin-io/resin-multivisor,nghiant2710/resin-supervisor