# GitLab CI/CD Pipeline for StarPunk
# Builds and pushes container images on version tags

stages:
  - build

variables:
  # Required for Docker-in-Docker
  DOCKER_TLS_CERTDIR: "/certs"
  # Use overlay2 driver for better performance
  DOCKER_DRIVER: overlay2

# Build and push container image
build-container:
  stage: build
  image: docker:24
  services:
    - docker:24-dind
  # Only trigger on version tags (e.g., v0.9.5, v1.0.0)
  rules:
    - if: $CI_COMMIT_TAG =~ /^v[0-9]+\.[0-9]+\.[0-9]+$/
  before_script:
    # Login to GitLab Container Registry
    - docker login -u $CI_REGISTRY_USER -p $CI_REGISTRY_PASSWORD $CI_REGISTRY
  script:
    # Build the container image with both version and latest tags
    - |
      docker build \
        --tag $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG \
        --tag $CI_REGISTRY_IMAGE:latest \
        --file Containerfile \
        .
    # Push both tags to the registry
    - docker push $CI_REGISTRY_IMAGE:$CI_COMMIT_TAG
    - docker push $CI_REGISTRY_IMAGE:latest
  # Cache Docker layers between builds
  cache:
    key: docker-$CI_COMMIT_REF_SLUG
    paths:
      - .docker-cache