Fetch before checkout (openml#1079)

PGijsbers · PGijsbers · commit cb8886010586 · 2023-02-23T15:32:03.000+01:00
Because the repository at the time of building the docker image is not
aware of branches that are created afterwards, which means otherwise
those are only accessible through the openml#branch syntax.
diff --git a/docker/startup.sh b/docker/startup.sh
@@ -44,6 +44,7 @@ if [ -n "$2" ]; then
     git fetch "$fork_url" "$fork_branch":branch_from_fork
     branch=branch_from_fork
   else
+    git fetch origin "$2"
     branch=$2
   fi
   if ! git checkout "$branch" ; then
