Docker-Image type cannot fetch images from ECR in new version 1.9.0.

[MarosBenadik]

Describe the bug

After migration to Concourse 7.12.0 we were unable to fetch images from ECR with the type of the resource docker-resource. Registry-image type worked same as in version 7.11.2.

It seems like the update to aws-sdk-go-v2 (ba8c089) in version 1.9.0 messed up the ECR implementation as we started to face issue with getting images from ECR repository. This was not a case in version 1.8.1

We provide aws_access_key_id, aws_secret_access_key but not aws_session_token. This was functioning in lower version Hovewer it seems like new version might require also aws_session_token.

Reproduction steps

1. Migration to new version of concourse 7.12.0 with the latest docker-image resource (1.9.0)
2. ECR Implementation for docker images
3. Run any pipeline with this resource type
   ...

Expected behavior

To be able to pull images from ECR without providing session token.

Additional context

No response