Generic Gitlab Pipeline to For Docker Image

.gitlab-ci.yml

---
variables:
  DEFAULT_DOCKER_FILE: "Dockerfile"
  DOCKER_IMAGE_NAME: "{{ imageName }}"

stages:
  - build

build-n-push-latest:
  stage: build
  image: docker:stable
  rules:
    - if: $CI_COMMIT_REF_NAME == $CI_DEFAULT_BRANCH
  services:
    - docker:dind
  script:
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
    - docker build -t $CI_REGISTRY/$CI_PROJECT_PATH/$DOCKER_IMAGE_NAME:latest -f $DEFAULT_DOCKER_FILE .
    - docker push $CI_REGISTRY/$CI_PROJECT_PATH/$DOCKER_IMAGE_NAME:latest

build-n-push-version:
  stage: build
  image: docker:stable
  rules:
    - if: $CI_COMMIT_TAG =~ /[v][0-9]+[.][0-9]+[.][0-9]+/
  services:
    - docker:dind
  script:
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
    - docker build -t $CI_REGISTRY/$CI_PROJECT_PATH/$DOCKER_IMAGE_NAME:CI_COMMIT_TAG -f $DEFAULT_DOCKER_FILE .
    - docker push $CI_REGISTRY/$CI_PROJECT_PATH/$DOCKER_IMAGE_NAME:$CI_COMMIT_TAG