This is an image that serves as the basis for various functions within the hyperledger fabric workflow such as chaincode compilation/execution, unit-testing, and even cluster simulation. It is based on ubuntu with various opensource projects added such as golang, rocksdb, grpc, and node.js. The actual hyperledger fabric code is injected just-in-time before deployment.
Why is there no :latest tag? We tightly couple the software to the docker image, so the software is always retrieving the exact version it wants.