Fixed CI submodules policy 🤞

2 jobs for develop in 49 seconds (queued for 1 minute and 20 seconds)
Status Job ID Name Coverage
  Build
failed #1302
build

00:00:49

 
  Deploy
skipped #1303
deploy_pages
 
Name Stage Failure
failed
build Build
Entering '_data/courses'
Entering '_posts'
Executing "step_script" stage of the job script
$ (cd ./_posts; git pull origin $CI_COMMIT_REF_NAME)
From https://gitlab.poul.org/sito/posts
* branch develop -> FETCH_HEAD
fatal: refusing to merge unrelated histories
Cleaning up file based variables
ERROR: Job failed: exit code 1