Merge branch 'lfs_fetch' into 'develop'

Fix CI failing fetch

See merge request orfeotoolbox/otb!438

.gitlab-ci.yml

@@ -18,8 +18,10 @@ variables:
   GIT_STRATEGY: "clone"
 
 before_script:
+  # make sure LFS hooks are installed
+  - git lfs install
   # Provision efficiently the local LFS cache before checkout
-  - git lfs fetch origin $CI_COMMIT_REF_NAME
+  - git lfs fetch origin $CI_COMMIT_SHA
   # Checkout the expected branch
   - git checkout $CI_COMMIT_REF_NAME