private LookupMode getLookupMode(boolean isPush) {
        return isPush ? LookupMode.PUSH : LookupMode.PULL;
    }
Try using the AWS credentials provided via ENV variables.
See https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html
src/main/java/io/fabric8/maven/docker/util/AuthConfigFactory.java