chore(ci): remove unnecessary Docker variables from CI config

Eliminate redundant Docker variables in the CI configuration to 
streamline the process. This simplifies the configuration file, 
ensuring clarity and reducing potential points of failure in the 
pipeline.

.gitlab-ci.yml

@@ -1,10 +1,6 @@
 include:
 - template: 'Workflows/MergeRequest-Pipelines.gitlab-ci.yml'
 
-variables:
-  DOCKER_HOST: tcp://docker:2375
-  DOCKER_DRIVER: overlay2
-
 stages:
   - build
   - deploy-prod