can't get authentication to work

[masterkain]

I'm a bit confused here, when I use the latest plugins/ecr on a kubernetes drone pipeline (no multiarch) I have no issues pushing with the same set of credentials.

if I switch to plugins/buildx-ecr I get 403. simplified code follows (.drone.jsonnet):

local DockerRepoSettings(build_args=null) = {
  registry: 'xxxx.dkr.ecr.eu-west-1.amazonaws.com',
  region: 'eu-west-1',
  access_key: {
    from_secret: 'ecr_access_key',
  },
  secret_key: {
    from_secret: 'ecr_secret_key',
  },
  repo: 'databases',
  platform: 'linux/amd64,linux/arm64',
  builder_driver: 'docker-container',
  debug: true,
};

    {
      name: 'push',
      image: 'plugins/buildx-ecr',
      privileged: true,
      settings: DockerRepoSettings(),
    },

build log extract:

#11 [auth] sharing credentials for xxxx.dkr.ecr.eu-west-1.amazonaws.com
#11 DONE 0.0s

#10 exporting to image
#10 pushing layers 1.2s done
#10 pushing manifest for xxxx.dkr.ecr.eu-west-1.amazonaws.com/databases:bstore_xxx_production-schema-1718982433-15@sha256:3c8d7f97a67eb7b4c720c2abf08da4d5e9154ac72fe9865346f3787951e6ed63
#10 pushing manifest for xxxx.dkr.ecr.eu-west-1.amazonaws.com/databases:bstore_xxx_production-schema-1718982433-15@sha256:3c8d7f97a67eb7b4c720c2abf08da4d5e9154ac72fe9865346f3787951e6ed63 0.2s done
#10 ERROR: failed to push xxxx.dkr.ecr.eu-west-1.amazonaws.com/databases:bstore_xxx_production-schema-1718982433-15: failed commit on ref "manifest-sha256:464a06b0890e736105984aa41ab29a45d87252ba87f3ad1a74bf4e273782e029": unexpected status from PUT request to https://xxxx.dkr.ecr.eu-west-1.amazonaws.com/v2/databases/manifests/sha256:464a06b0890e736105984aa41ab29a45d87252ba87f3ad1a74bf4e273782e029: 403 Forbidden
------
 > exporting to image:
------
WARNING: current commit information was not captured by the build: git was not found in the system: exec: "git": executable file not found in $PATH
ERROR: failed to solve: failed to push xxxx.dkr.ecr.eu-west-1.amazonaws.com/databases:bstore_xxx_production-schema-1718982433-15: failed commit on ref "manifest-sha256:464a06b0890e736105984aa41ab29a45d87252ba87f3ad1a74bf4e273782e029": unexpected status from PUT request to https://xxxx.dkr.ecr.eu-west-1.amazonaws.com/v2/databases/manifests/sha256:464a06b0890e736105984aa41ab29a45d87252ba87f3ad1a74bf4e273782e029: 403 Forbidden
exit status 1