private Map getAuthConfigMapToCheck(LookupMode lookupMode, Map authConfigMap) {
        String configMapKey = lookupMode.getConfigMapKey();
        if (configMapKey == null) {
            return authConfigMap;
        }
        if (authConfigMap != null) {
            return (Map) authConfigMap.get(configMapKey);
        }
        return null;
    }
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