Update .gitlab-ci.yml file

.gitlab-ci.yml

-# This file is a template, and might need editing before it works on your project.
-# This is a sample GitLab CI/CD configuration file that should run without any modifications.
-# It demonstrates a basic 3 stage CI/CD pipeline. Instead of real tests or scripts,
-# it uses echo commands to simulate the pipeline execution.
-#
-# A pipeline is composed of independent jobs that run scripts, grouped into stages.
-# Stages run in sequential order, but jobs within stages run in parallel.
-#
-# For more information, see: https://docs.gitlab.com/ee/ci/yaml/index.html#stages
-#
-# You can copy and paste this template into a new `.gitlab-ci.yml` file.
-# You should not add this template to an existing `.gitlab-ci.yml` file by using the `include:` keyword.
-#
-# To contribute improvements to CI/CD templates, please follow the Development guide at:
-# https://docs.gitlab.com/ee/development/cicd/templates.html
-# This specific template is located at:
-# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Getting-Started.gitlab-ci.yml
+default:
+  tags: 
+    - medium
 
-stages:          # List of stages for jobs, and their order of execution
+stages:         
   - build
-  - push_to_registry
 
 build-job:       # This job runs in the build stage, which runs first.
   stage: build