This is a (failing) test case for building a monorepo using Yarn 2 workspaces with yarn.build in Docker, taking advantage of the Docker build cache.
This monorepo contains three packages: packageA, packageB, and
packageC. packageA has no dependencies. packageB depends on
packageA, and packageC depends on packageB.
The Dockerfile first adds all files that are needed for Yarn to
install dependencies, and then runs yarn to do so. It then first
builds packageA which has no dependencies. Then it builds
packageB, which depends on packageA, which has already been
built. Finally, it builds packageC.
To execute the Dockerfile run the following command:
docker build .
The build fails because it tries to build packageB when its files
(other than package.json) have not been copied yet.