make .build_assets.yml more flexible

.build_assets_script: &build_assets_script |

  for item in ${LAYOUTS[*]}; do

    cd $CI_PROJECT_DIR/working/$item && npm install && npm run minify;

  done

.build_assets:

  extends: .before_assets

  stage: build

      - working/**/*

  script:

  # здесь задается скрипт для сборки верстки

  - for item in ${LAYOUTS[*]}; do   cd $CI_PROJECT_DIR/working/$item && npm install && npm run minify;  done

  - *build_assets_script

  artifacts:

    paths:

    - "working/*/dist"