Merge pull request #639 from EESSI/tweak_k8s_post

Switch month for K8S blogpost and inject a `more` break

Author: trz42

docs/blog/posts/2025/11/eessi-k8.md docs/blog/posts/2025/12/eessi-k8.mddocs/blog/posts/2025/11/eessi-k8.md renamed to docs/blog/posts/2025/12/eessi-k8.md

@@ -13,6 +13,8 @@ Implementing an integration of EESSI with Kubernetes will allow the many sites a
 
 In this blog post, we present a proof of concept (PoC) for deploying EESSI on a Kubernetes cluster.
 
+<!-- more -->
+
 !!! note
     A basic knowledge on running containerized applications is assumed.