002e1a441e
My previous PR didn't properly handle uppercase usernames (or repository names) when signing container images with `cosign`. It seems that the `docker buildx --push` doesn't like this either, but it's passed the output of the `docker/metadata-action` which seems to lowercase things. Fixes: https://github.com/actions/starter-workflows/issues/1293 Signed-off-by: Matt Moore <mattmoor@chainguard.dev>