While we await am answer wrt a RC Docker image for testing, you could build an image locally too (and rather easily):
git clonethe Dgraph repo locally.cd dgraph- Create a new branch from the target tag:
git checkout -b <branch-name> tags/<your-tag-of-choice> - Run
make imageto build a Docker image. The new image would be tagged asdgraph-local. - Run
docker imageto list the new image and start a cluster using the same.
HTH!