Setting up CI with jekyll and gitlab

stages:          # List of stages for jobs, and their order of execution
  - build
  - deploy

variables:
  S3_BUCKET_NAME: <S3 bucket name>
  CDN_DISTRIBUTION_ID: <CDN distribution ID>

cache:
  paths:
  - vendor/
  - node_modules/

prepare_npm:
  stage: build
  image: node:latest
  script:
    - yarn install
  only:
  - tags

generate_pages:
  stage: build
  image: ruby:2.6
  needs:
    - prepare_npm
  before_script:
    - gem install bundler -v 2.4.15
  script:
    - bundle install --path vendor
    - bundle exec jekyll build -d public
  artifacts:
    paths:
    - public
  only:
  - tags

deploy_s3:
  stage: deploy
  image: python:latest
  dependencies:
    - generate_pages
  before_script:
    - pip install awscli
  script:
    - aws s3 cp public s3://$S3_BUCKET_NAME --recursive
    - aws cloudfront create-invalidation --distribution-id $CDN_DISTRIBUTION_ID --paths "/*"
  only:
  - tags

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Sid": "VisualEditor0",
            "Effect": "Allow",
            "Action": [
                "s3:PutObject",
                "s3:GetObject",
                "s3:DeleteObject",
                "cloudfront:CreateInvalidation"
            ],
            "Resource": [
                "arn:aws:s3:::<S3 bucket name>/*",
                "arn:aws:cloudfront::<cloudfront distribution ID>"
            ]
        }
    ]
}