unable to push multi-arch images to `public.ecr.aws`

[masterkain]

hello,
in drone I've used different docker plugins with some success: plugins/ecr, thegeeklab/drone-docker-buildx, plugins/kaniko-ecr:1.5.1-kaniko1.8.1

now I have this project where I have to pull base images from a mirror, build multi-arch and push to ECR (public) but I cannot find the right combination of parameters to pass to drone-docker-buildx-ecr - maybe some are straight up incompatible.

+ /usr/local/bin/dockerd --data-root /var/lib/docker --host=unix:///var/run/docker.sock
Detected registry credentials

Error response from daemon: login attempt to https://public.ecr.aws/v2/ failed with status: 400 Bad Request

time="2022-08-13T17:56:21Z" level=fatal msg="Error authenticating: exit status 1"
time="2022-08-13T17:56:21Z" level=fatal msg="exit status 1"

I've now wasted a bit of time trying to get this working, do you have any tips to share? like registry and repo string formats.
Public AWS has a registry like `https://public.ecr.aws/u8b9s1p2' which should be the root, then you have the repos.

[masterkain]

drone-plugins/drone-docker#357