Add CI config

.gitlab-ci.yml

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+# This file is a template, and might need editing before it works on your project.
+# 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
+
+# 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
+
+before_script:
+  - pip install -Ur requirements.txt
+
+stages: # List of stages for jobs, and their order of execution
+  - test
+  - build
+
+build-job: # This job runs in the build stage, which runs first.
+  stage: build
+  script:
+    - echo "Building the Docker image..."
+    - echo $CI_REGISTRY_PASSWORD | docker login -u $CI_REGISTRY_USER $CI_REGISTRY --password-stdin
+    - docker build -t $CI_REGISTRY_IMAGE .
+    - docker push $CI_REGISTRY_IMAGE
+    - echo "Build complete."
+
+unit-test-job: # This job runs in the test stage.
+  stage: test
+  script:
+    - echo "Running unit tests..."
+    - python3 -munittest discover
+    - echo "Testing complete"
+
+lint-test-job: # This job also runs in the test stage.
+  stage: test # It can run at the same time as unit-test-job (in parallel).
+  script:
+    - echo "Linting code..."
+    - pylint -j0 -v $(git ls-files '*.py')
+    - echo "No lint issues found."