[CI/CD] GitLab CI에서 변경된 서비스만 빌드하는 동적 파이프라인 구축

# .gitlab-ci.yml

stages:
  - detect-changes
  - trigger-build

variables:
  DOCKER_REGISTRY: 'harbor.example.com/myproject'

# Stage 1: 변경 서비스 감지 → child pipeline YAML 동적 생성
detect-changed-services-dev:
  stage: detect-changes
  image: python:3.9-slim
  before_script:
    - apt-get update -y
    - apt-get install -y git jq make
  script: |
    SERVICES_JSON=$(make detect-changed)

    if [ "$SERVICES_JSON" = "[]" ]; then
      MATRIX="[]"
    else
      # JSON 배열 → parallel:matrix 형식으로 변환
      MATRIX=$(echo "$SERVICES_JSON" | jq -c 'map({"SERVICE_NAME": .})')
    fi

    # child-pipeline.yml을 동적으로 생성
    cat << EOF > child-pipeline.yml
    build-service:
      stage: build
      image: docker:23.0.0-dind
      services:
        - docker:23.0.0-dind
      variables:
        DOCKER_REGISTRY: '$DOCKER_REGISTRY'
        HARBOR_USERNAME: '$HARBOR_USERNAME'
        HARBOR_PASSWORD: '$HARBOR_PASSWORD'
      before_script:
        - apk add --update make
        - echo "\$HARBOR_PASSWORD" | docker login --username "\$HARBOR_USERNAME" --password-stdin \$DOCKER_REGISTRY
      script: |
        make dev-build-service \$SERVICE_NAME
        make dev-push-service \$SERVICE_NAME
        make dev-clean-service \$SERVICE_NAME
        docker logout \$DOCKER_REGISTRY
      parallel:
        matrix: $(echo "$MATRIX")
    EOF
  artifacts:
    paths:
      - child-pipeline.yml
  rules:
    - if: '$CI_COMMIT_REF_NAME == "dev"'

# Stage 2: 생성된 child pipeline 트리거
trigger-child-pipeline-dev:
  stage: trigger-build
  trigger:
    include:
      - artifact: child-pipeline.yml
        job: detect-changed-services-dev
  needs:
    - detect-changed-services-dev
  rules:
    - if: '$CI_COMMIT_REF_NAME == "dev"'

# prod 브랜치 감지
detect-changed-services-prod:
  stage: detect-changes
  # ... (위와 동일한 구조, prod 빌드 명령 사용)
  rules:
    - if: '$CI_COMMIT_REF_NAME == "main"'

trigger-child-pipeline-prod:
  stage: trigger-build
  trigger:
    include:
      - artifact: child-pipeline.yml
        job: detect-changed-services-prod
  needs:
    - detect-changed-services-prod
  rules:
    - if: '$CI_COMMIT_REF_NAME == "main"'