Doc: make sphinx-multiversion play nicely with gitlab-ci

We need to add back the correct remote to let sphinx-multiversion do its job.

Also for some reasons, "git describe" doesn't work in gitlab-ci, so
let's use git tag --list | tail instead

.gitlab-ci.yml

@@ -37,9 +37,12 @@ pages:
   script:
     - pip install .
     - pip install .[doc]
+    # sphinx-multiversion needs to have all the branches
+    - git remote add upstream https://gitlab.com/Oslandia/py3dtiles.git
+    - git fetch upstream
     - sphinx-multiversion docs public
     - cp -rv docs/index_redirect.html public/index.html
-    - current_version="$(git describe --tags --abbrev=0)"
+    - current_version="$(git tag --list | tail -n1)"
     - sed -i "s/VERSION/$current_version/g" public/index.html
   artifacts:
     paths:

docs/conf.py

@@ -105,7 +105,8 @@
 smv_branch_whitelist = r'^master$'
 
 # Whitelist pattern for remotes (set to None to use local branches only)
-smv_remote_whitelist = None
+# set to upstream because we add this remote for gitlab, see .gitlab-ci.yml
+smv_remote_whitelist = r'^upstream|origin$'
 
 # Pattern for released versions
 smv_released_pattern = r'^tags/.*$'