Arion: Add diun docker update notifications

hosts/franz/arion/infrastructure/arion-compose.nix

@@ -103,5 +103,34 @@
         "/home/ghoscht/.docker/infrastructure/dyndns.env"
       ];
     };
+    diun.service = {
+      image = "crazymax/diun:4.28";
+      container_name = "diun";
+      restart = "always";
+      command = "serve";
+      volumes = [
+        "/storage/dataset/docker/infrastructure/diun_data:/data"
+        "/var/run/docker.sock:/var/run/docker.sock"
+      ];
+      labels = {
+        "diun.enable" = "true";
+      };
+      environment = {
+        TZ = "Europe/Berlin";
+        LOG_LEVEL = "info";
+        DIUN_WATCH_WORKERS = "20";
+        DIUN_WATCH_SCHEDULE = "0 */6 * * *";
+        DIUN_WATCH_JITTER = "30s";
+        DIUN_WATCH_RUNONSTARTUP = "true";
+        DIUN_PROVIDERS_DOCKER = "true";
+        DIUN_PROVIDERS_DOCKER_WATCHBYDEFAULT = "true";
+
+        DIUN_NOTIF_NTFY_ENDPOINT = "http://ntfy";
+        DIUN_NOTIF_NTFY_TOPIC = "docker-updates";
+      };
+      networks = [
+        "dmz"
+      ];
+    };
   };
 }