add current warning status

Author: paulsavoie

docs/_data/status.yml

@@ -1,8 +1,11 @@
 # possible types are good, warning, critical
 current:
-    type: good #values: good | warning | error
-    # title: 'All systems are operational' # always restore this message when going back to 'good'
-    # description: |      
+    type: warning #values: good | warning | error
+    title: 'Signing operations with certain certificates do not work'  # 'All systems are operational' # always restore this message when going back to 'good'
+    description: |
+      Signing does currently not work with certificates that 
+        * haven't been used after April 2026 and 
+        * the keys of which are stored on the Software SignService.
     # link:
 planned:
 incidents: