=> ERROR [internal] load metadata for docker.io/library/ruby:2.6.6 0.9s
[internal] load metadata for docker.io/library/ruby:2.6.6:
failed to solve: rpc error: code = Unknown desc = failed to solve with frontend dockerfile.v0: failed to create LLB definition: rpc error: code = Unknown desc = error getting credentials - err: exit status 1, out: ``
docker pull ruby:2.6.6
でかいけつ