Gitlab CI/CD for Rails, Postgres, Rspec, Brakeman

.gitlab-ci.yaml

stages:
  - build
  - test
  - deploy

.base:
  image: ruby:2.7.0
  cache:
    key: gems_and_packages
    paths:
      - apt-cache
      - vendor/ruby
      - .yarn-cache
    policy: pull
  before_script:
    - gem install bundler --no-document
    - bundle install --jobs $(nproc) "${FLAGS[@]}" --path=vendor/ruby

.base_db:
  extends: .base
  services:
    - postgres:latest
  variables:
    POSTGRES_DB: test_db
    POSTGRES_USER: runner
    POSTGRES_PASSWORD: ""
    POSTGRES_HOST_AUTH_METHOD: trust
  before_script:
    # install yarn & dependencies
    - export APT_CACHE_DIR=`pwd`/apt-cache && mkdir -pv $APT_CACHE_DIR
    - wget -q -O - https://dl.yarnpkg.com/debian/pubkey.gpg | apt-key add -
    - echo "deb https://dl.yarnpkg.com/debian/ stable main" > /etc/apt/sources.list.d/yarn.list
    - apt-get update -qq && apt-get -o dir::cache::archives="$APT_CACHE_DIR" install -y yarn
    - yarn config set cache-folder .yarn-cache
    - yarn install

    - gem install bundler --no-document
    - bundle install --jobs $(nproc) "${FLAGS[@]}" --path=vendor/ruby

    # Setup test database
    - cp config/database.yml.ci config/database.yml
    - RAILS_ENV=test bundle exec rails db:create db:migrate db:schema:load

build:rubocop:
  extends: .base
  stage: build
  cache:
    policy: pull-push
  script:
    - bundle exec rubocop

build:assets_precompile:
  extends: .base_db
  stage: build
  script:
    - bundle exec rails assets:precompile

test:rspec:
  extends: .base_db
  stage: test
  script:
    - bundle exec rspec

test:brakeman:
  extends: .base
  stage: test
  allow_failure: true
  script:
    - bundle exec brakeman

deploy:staging:
  extends: .base
  stage: deploy
  only:
    - staging
  script:
    - echo "Deploying to Staging..."