Describe the bug

crane auth get keys have changed to lowercase.

To Reproduce

$ crane auth login myregistry -u username -p password
2026/02/20 09:49:39 logged in via /home/xxx/.docker/config.json

$ crane auth get myregistry
{"username":"username","secret":"password"}

Expected behavior

$ crane auth get myregistry
{"Username":"username","Secret":"password"}

Expected keys to be Username and Secret, but were username and secret.

Additional context

This is a breaking change and divergence from other cli tools e.g. docker-credential-desktop.

• crane version: 0.21.0
• Relevant commit: d5817d5

• go-containerregistry/cmd/crane/cmd/auth.go

  Lines 117 to 120 in d5817d5

  	type credentials struct {
  	Username string `json:"username,omitempty"`
  	Secret string `json:"secret,omitempty"`
  	}