Gitlab CI + Hugo module : error

EDIT: well there seems to be a fix!
EDIT 2 : The fix (=particular docker image) works, thanks for your help!

Thanks a lot, I’m gonna try. I’m on Gitlab and not Github and I’m not used to “push hook”… This is a huge problem if it doesn’t even work with Netlify!

Before I try this, here is a simple Gitlab Repo, which crashes, with the following errors. The repo is just a fork of wowchemy starter one plus a gitlab-ci.yml file

Running with gitlab-runner 13.5.0-rc2 (71c90c86)
  on docker-auto-scale 0277ea0f
Resolving secrets
00:00
Preparing the "docker+machine" executor
Using Docker executor with image monachus/hugo:latest ...
Pulling docker image monachus/hugo:latest ...
Using docker image sha256:dcd115f9613844746e5715e71aa24c2b88c2c18b518d469c07fb941ef9f03883 for monachus/hugo:latest with digest monachus/hugo@sha256:60ef3e3e2b9c650c6cf9988adfc06008edab8bf5d901e88c4216183a4f072b90 ...
Preparing environment
00:04
Running on runner-0277ea0f-project-21977324-concurrent-0 via runner-0277ea0f-srm-1603462103-055ce102...
Getting source from Git repository
00:02
$ eval "$CI_PRE_CLONE_SCRIPT"
Fetching changes with git depth set to 50...
Initialized empty Git repository in /builds/bthierry/hugo-module/.git/
Created fresh repository.
Checking out fdefbc7f as master...
Skipping Git submodules setup
Executing "step_script" stage of the job script
00:01
$ hugo
Total in 4 ms
Error: we found a go.mod file in your project, but you need to install Go to use it. See https://golang.org/dl/.: module "github.com/wowchemy/wowchemy-hugo-modules/netlify-cms-academic" not found; either add it as a Hugo Module or store it in "/builds/bthierry/hugo-module/themes".: module does not exist
Cleaning up file based variables
00:00
ERROR: Job failed: exit code 1