Use a bootstrap.sh script to reduce size of image

By installing, building, and cleaning up cache and build files within a
single run command, we avoid having those cache and build files included
in the final Docker image. This saves about 150MB off of the final image.
Switch to a camper_van based versioning scheme

Format is [CAMPER_VAN_VERSION].[DOCKER_IMAGE_PATCH_VERSION]. Meaning
that "0.0.10.0" is the first release of the camper_van docker image
using version "0.0.10" of camper_van. Should the image be updated to
improve/fix something, the next version would be "0.0.10.1".