Add las-gethmann to epics roles

epics.yml

 ---
-- hosts: localhost
+- hosts: epics
   roles:
     - epics

hosts

@@ -100,6 +100,7 @@ las-gethmann.las.kit.edu
 
 [epics]
 las113.las.kit.edu
+las-gethmann.las.kit.edu
 
 [ripgrep]
 las113.las.kit.edu