gitlab-ci: fix test preview feature

.gitlab-ci.yml

@@ -26,16 +26,12 @@ pages:
       fi
     - rm -rf public/$CURRENT_CONTENT_PATH || true # remove last version of current branch
   script:
+    - | # sed needs to be in its own section
+      sed -i "s|destdir.*|destdir: ./public/$CURRENT_CONTENT_PATH|" ikiwiki.setup
     - ikiwiki --setup ikiwiki.setup
     - | # create symbolic link to index.en.html if public/index.html does not exist
-      if [ ! -L "public/index.html"  ]; then
-        ln -s index.en.html public/index.html
-      fi
-    - |
-      if [ -z "$CURRENT_CONTENT_PATH" ]; then
-        mv public output
-        mkdir -p public
-        mv public public/$CURRENT_CONTENT_PATH
+      if [ ! -L "public/$CURRENT_CONTENT_PATH/index.html"  ]; then
+        ln -s index.en.html public/$CURRENT_CONTENT_PATH/index.html
       fi
     - cd public/$EPHEMERAL_BRANCHES_PATH
     - tree -d -H '.' -L 1 --noreport --charset utf-8 -T "Versions" -o index.html # generate a root HTML listing all previews for easier access