Gitlab CI push to docker-registry fails - docker

Question

I have GitLab server and a separate docker-registry. I have created a testuser with a testpassword.
My .gitlab-ci.yml
image: docker:latest
services:
- docker:18.09.7-dind
variables:
DOCKER_HOST: tcp://docker:2375/
DOCKER_DRIVER: overlay2
# See https://github.com/docker-library/docker/pull/166
DOCKER_TLS_CERTDIR: ""
REGISTRY: myregistry:5000/golang-test
stages:
- build
# - test
before_script:
- docker login -u testuser -p testpassword myregistry:5000
build_project:
stage: build
tags:
- docker-ci
script:
- docker ps
- docker build -t $REGISTRY .
- docker push $REGISTRY
When CI pipeline runs, I get following error.
WARNING! Using --password via the CLI is insecure. Use
--password-stdin. Error response from daemon: Get https://myregistry:5000/v2/: dial tcp: lookup worker1 on
192.168.123.456:53: no such host ERROR: Job failed: exit code 1
concurrent = 1
check_interval = 0
[session_server]
session_timeout = 1800
[[runners]]
name = "docker-ci"
url = "https://gitlab.sample.com:8000/"
token = "89MfxRTby83ny3eTkTf2"
tls-ca-file = "/etc/gitlab-runner/certs/gitlab.sample.com.crt"
executor = "docker"
pre_build_script = "export DOCKER_HOST=tcp://docker:2375"
[runners.custom_build_dir]
[runners.cache]
[runners.cache.s3]
[runners.cache.gcs]
[runners.docker]
tls_verify = false
image = "ubuntu:18.04"
privileged = true
disable_entrypoint_overwrite = false
oom_kill_disable = false
disable_cache = false
volumes = ["/cache"]
shm_size = 0
This was after suggested modifications here.
I can successfully login to my docker-registry using docker login -u testuser -p testpassword https://myregistry:5000 from gitlab running server. refered
After uwe-plonuscomment, I have added following part, but still same error.
before_script:
- echo "192.168.10.219 worker1" >> /etc/hosts
- docker login -u testuser -p testpassword myregistry:5000