GitLab runner not able to fetch AWS ECR images in the current AWS account
I use this script in gitlab-ci.yml

image: docker:19.03
services:
- docker:19.03.0-dind
before_script:
- $(aws ecr get-login --no-include-email --region eu-central-1)


... and provide AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY variables into Settings/CI-CD section. 
Ensure your region with images is the same where are you logging in.