Add FOSDEM23 talk (#2133)

Signed-off-by: Márk Sági-Kazár <sagikazarmark@users.noreply.github.com>

docs/eso-talks.md

@@ -21,3 +21,7 @@ A list of talks given by people at conferences and events. Feel free to let us k
 ## AWS Containers from the Couch
 
 [![AWS Containers from the Couch](https://img.youtube.com/vi/FityN80Cpto/0.jpg)](https://www.youtube.com/watch?v=FityN80Cpto)
+
+## FOSDEM '23 (Containers devroom)
+
+[![FOSDEM '23 (Containers devroom)](https://slides.sagikazarmark.hu/2023-02-04-automating-secret-rotation-in-kubernetes/preview.png)](https://fosdem.org/2023/schedule/event/container_kubernetes_secret_rotation/)