Fix build_kpi_image

Fixes the following error in build_kpi_image job:

$ docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
WARNING! Using --password via the CLI is insecure. Use --password-stdin.
error during connect: Post "http://docker:2375/v1.24/auth": dial tcp: lookup docker on 149.220.4.2:53: no such host