Use official Hugo docker image instead of the outdated klakegg/hugo

The tag "latest" doesn't yet exists, so let's pin to the last
version for now.

Signed-off-by: Dylan Aïssi <dylan.aissi@collabora.com>

.gitlab-ci.yml

@@ -39,7 +39,7 @@ test-images:
 
 test-html:
   image:
-    name: klakegg/hugo:latest
+    name: ghcr.io/gohugoio/hugo:v0.135.0
     entrypoint: [""]
   stage: generate-html
   tags:

run_hugo.sh

@@ -9,6 +9,6 @@ docker run \
   -u $(id -u) \
   -v ${REPO}:/source \
   --security-opt label=disable \
-  klakegg/hugo:latest \
+  ghcr.io/gohugoio/hugo:v0.135.0 \
   $@