fix: graceful fallback when no zim archives present

kubernetes/apps/media/bulk-storage/apps.yaml

@@ -152,7 +152,13 @@ spec:
           command:
             - /bin/sh
             - -c
-            - "kiwix-serve --port 8080 /data/*.zim"
+            - |
+              if ls /data/*.zim 1> /dev/null 2>&1; then
+                exec kiwix-serve --port 8080 /data/*.zim
+              else
+                echo "No .zim archives found in /data. Waiting for files..."
+                sleep infinity
+              fi
           ports:
             - containerPort: 8080
           volumeMounts: