Gitlab CI + Hugo module : error

This is my working gitlab-ci.yml. I suppose the HUGO_ENV - production is required because it’s set to DEV by default.

image:
    name: klakegg/hugo:ext-alpine
    entrypoint : ['']

variables:
  GIT_SUBMODULE_STRATEGY: recursive
  HUGO_ENV: "production"

test:
  script:
  - hugo
  except:
  - master

pages:
  script:
  - hugo
  artifacts:
    paths:
    - public
  only:
  - master

I upgraded Wowchemy (formerly Academic) and this was what broke things. The GitLab CI file I linked above fixes it.