chore: Update to build max. 6 images

check-version.sh

@@ -4,5 +4,5 @@ if [ -f ./version_list ]; then
     rm version_list
 fi
 
-LAST_VERSIONS=1
+LAST_VERSIONS=6
 curl -L -s https://api.github.com/repos/kubernetes/kubectl/git/refs/tags | jq -r '.[].ref' | grep -E '^refs/tags/kubernetes-[[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+$' | sed 's/refs\/tags\/kubernetes-//' | sort | tail -n ${LAST_VERSIONS} > version_list;
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