GitLab CI configuration to lint and build Docker images and push them to AWS ECR

.gitlab-ci.yml

stages:
  - Lint images
  - Build and publish images 

## Load a node.js image, install dockerlint and lint all Dockerfiles
linting:
  stage: Lint images
  image: node:4-alpine
  script:
    - npm install -g dockerlint && npm cache clean
    - find ./ -name Dockerfile -exec dockerlint {} \;

## Load a docker image and install AWS CLI and
## use docker:dind as a service to build all images 
## and push them to the registry 
publishing:
  stage: Build and publish images 
  image: docker:latest
  services:
    - docker:dind
  only: 
    - master
  script:
    - export DEBIAN_FRONTEND=noninteractive

    # Install nodejs and python
    - apk update -qy && apk add -y --no-cache nodejs curl unzip bash
    - apk add --no-cache python3 && python3 -m ensurepip &&  rm -r /usr/lib/python*/ensurepip && pip3 install --upgrade pip setuptools && if [ ! -e /usr/bin/pip ]; then ln -s pip3 /usr/bin/pip ; fi && if [[ ! -e /usr/bin/python ]]; then ln -sf /usr/bin/python3 /usr/bin/python; fi && rm -r /root/.cache

    # Install AWS CLI
    - curl "https://s3.amazonaws.com/aws-cli/awscli-bundle.zip" -o "awscli-bundle.zip"
    - unzip awscli-bundle.zip
    - ./awscli-bundle/install -i /usr/local/aws -b /usr/local/bin/aws

    # Login to AWS ECR
    - $(aws ecr get-login --no-include-email --region ${AWS_REGION})

    # Build all images over here. This is only a placeholder for
    # e.g. your magic script to build all images in your repo.
    - docker build ...
    - docker tag ...
    - docker push ...