.gitlab-ci.yml

image: docker:19.03.5
services:
  - docker:19.03.5-dind
  
stages:  # used to group jobs together
  - Build
  - Push

before_script:  # needed for most jobs
  - apk add python3  # needed for awscli
  - pip3 install awscli==1.18.8
  - docker load --input data/image.tar  # loads artifact
  - $(aws ecr get-login --no-include-email --region us-east-1)  # run this command, then run the output of the command

Build:  # name of job
  stage: Build  # which stage its put in
  before_script: []  # overrides before script
  script:  # script used to run job
    - mkdir data/
    - docker build --compress -t proxy .  # compress when doing deploy jobs, tag it proxy
    - docker save --output data/image.tar proxy  # save image to image.tar to save as an artifact
  artifacts:
    name: image
    paths:
      - data/

Push Dev:  # name of job
  stage: Push
  script:
    - docker tag proxy:latest $ECR_REPO:dev  # tag with repo name
    - docker push $ECR_REPO:dev
  rules:
    - if: "$CI_COMMIT_BRANCH == 'main'"  # can only run if branch is main

Push Release:
  stage: Push
  script:
    - export TAGGED_ECR_REPO=$ECR_REPO:$(echo $CI_COMMIT_TAG | sed 's/-release//')  # sed strips off -release from commit tag to leave just version name
    - docker tag proxy:latest $TAGGED_ECR_REPO
    - docker push $TAGGED_ECR_REPO
    - docker tag $TAGGED_ECR_REPO $ECR_REPO:latest  # tag with :latest to show latest version
    - docker push $ECR_REPO:latest
  rules:
    - if: "$CI_COMMIT_TAG =~ /^*-release$/"  # identifies regex, any tag that ends with release