Gitlab runner - could not resolve host

Summary

Hey guys! I'm having a problem with my runner up in Kubernetes and I'm already getting furious for not finding a solution. Sometimes, when a job is started I run into an error right at the beginning:

fatal: unable to access https://git.exemple.io: Could not resolve host: git.exemple.io

Steps to reproduce

Implement the catalog via Rancher and apply some customizations in answers.yml of the Helm Chart.

---
  image: gitlab/gitlab-runner:alpine-v12.1.0
  checkInterval: "90"
  concurrent: "25"
  gitlabUrl: "https://git.exemple.io/"
  rbac: 
    create: "true"
  resources: 
    limits: 
      cpu: "200m"
      memory: "256Mi"
    requests: 
      cpu: "150m"
      memory: "128Mi"
  runnerRegistrationToken: "********************"
  runners: 
    pollTimeout: "720"
    privileged: "true"
    requestConcurrency: "30"
    runUntagged: "true"
    tags: "devops-prod"
    image: "ubuntu:18.04"
    cloneUrl: "https://git.exemple.io"
    builds:
      cpuLimit: "400m"
      memoryLimit: "512Mi"
      cpuRequests: "400m"
      memoryRequests: "512Mi"
    services:
      cpuLimit: "400m"
      memoryLimit: "512Mi"
      cpuRequests: "400m"
      memoryRequests: "512Mi"
  terminationGracePeriodSeconds: "12000"

.gitlab-ci.yml

# =============================================================================
# INCLUDE TEMPLATES
# =============================================================================

include:
  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-audit.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-base.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-build.yml"
    
  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-dast.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-deploy.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-global.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-scanning.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-sonarqube.yml"
    
  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-web-performance.yml"

  - project: "shared/devops/pipeline"
    file: "/ci/.gitlab-ci-rules.yml"

# =============================================================================
# DEFAULT IMAGE
# =============================================================================

image: docker:19.03.0

# =============================================================================
# SERVICES
# =============================================================================

services:
  - docker:19.03.0-dind

# =============================================================================
# STAGES
# =============================================================================

stages: [ reports, build, scanning, deploy, web-performance, dast ]

# =============================================================================
# WORKFLOW RULES
# =============================================================================

workflow:
  rules:
    - if: $PIPELINE_DISABLE == "true"
      when: never
    - if: $CI_MERGE_REQUEST_ID
      when: never
    - when: always

# =============================================================================
# GLOBAL VARIABLES
# =============================================================================

variables:
  DOCKER_HOST: tcp://localhost:2375
  DOCKER_TLS_CERTDIR: ""
  DOCKER_DRIVER: overlay2
  DOCKER_BUILDKIT: 1
  GIT_DEPTH: 1
  GIT_SUBMODULE_STRATEGY: none
  GIT_STRATEGY: none

Actual behavior

The job breaks.

Expected behavior

The job should be successful.

Relevant logs and/or screenshots

job log

1 Running with gitlab-runner 12.7.1 (003fe500)
2   on gitlab-runner-all-develop-gitlab-runner-ff99c489d-7br7w B7HYCxmV
3
Using Kubernetes namespace: gitlab-runner-all-develop
00:00
4 Using Kubernetes executor with image docker:19.03.0 ...
6
Waiting for pod gitlab-runner-all-develop/runner-b7hycxmv-project-80-concurrent-08vcld to be running, status is Pending
00:03
7 Running on runner-b7hycxmv-project-80-concurrent-08vcld via gitlab-runner-all-develop-gitlab-runner-ff99c489d-7br7w...
9
Fetching changes with git depth set to 1...
00:06
10 Initialized empty Git repository in /builds/ads/signo/api/cache/.git/
11 Created fresh repository.
12 fatal: unable to access 'https://git.stefanini.io/ads/signo/api/cache.git/': Could not resolve host: git.stefanini.io
15 ERROR: Job failed: command terminated with exit code 1

Environment description

My gitlab server is in Kubernetes as is my gitlab runner. Yes, we are in a customized environment.

config.toml contents

listen_address = "[::]:9252"
concurrent = 25
check_interval = 90
log_level = "info"

[session_server]
  session_timeout = 1800

[[runners]]
  name = "gitlab-runner-all-develop-gitlab-runner-ff99c489d-7br7w"
  output_limit = 4096
  request_concurrency = 30
  url = "https://git.exemple.io/"
  token = "*********************"
  executor = "kubernetes"
  clone_url = "https://git.exemple.io"
  [runners.custom_build_dir]
  [runners.cache]
    [runners.cache.s3]
    [runners.cache.gcs]
  [runners.kubernetes]
    host = ""
    bearer_token_overwrite_allowed = false
    image = "ubuntu:18.04"
    namespace = "gitlab-runner-all-develop"
    namespace_overwrite_allowed = ""
    privileged = true
    cpu_limit = "400m"
    memory_limit = "512Mi"
    service_cpu_limit = "400m"
    service_memory_limit = "512Mi"
    cpu_request = "400m"
    memory_request = "512Mi"
    service_cpu_request = "400m"
    service_memory_request = "512Mi"
    poll_timeout = 720
    service_account_overwrite_allowed = ""
    pod_annotations_overwrite_allowed = ""
    [runners.kubernetes.pod_security_context]
    [runners.kubernetes.volumes]