Use lightweight runners

.gitlab-ci.yml

@@ -5,6 +5,8 @@ variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
 test:
+  tags:
+    - lightweight
   script:
   - hugo
   artifacts:
@@ -14,6 +16,8 @@ test:
   - main
 
 pages:
+  tags:
+    - lightweight
   script:
   - BASEURL=${CI_PAGES_URL##http:} # don't force stuff on plain HTTP when publishing on HTTPS
   - hugo -b "${BASEURL:-/}"