Fix: serverinfo 'available' wasn't set for BTC

BTCPayServer/Services/NBXSyncSummaryProvider.cs

@@ -36,7 +36,8 @@ namespace BTCPayServer.Services
                         VerificationProgress = s.VerificationProgress
                     } : null,
                     ChainHeight = summary.Status.ChainHeight,
-                    SyncHeight = summary.Status.SyncHeight
+                    SyncHeight = summary.Status.SyncHeight,
+                    Available = summary.Status.IsFullySynched
                 });
         }
         

BTCPayServer/wwwroot/swagger/v1/swagger.template.serverinfo.json

@@ -103,6 +103,11 @@
                         "format": "integer",
                         "nullable": true,
                         "description": "The height of the latest indexed block of the internal indexer"
+                    },
+                    "available": {
+                        "type": "boolean",
+                        "description": "True if the full node and the indexer are fully synchronized",
+                        "nullable": false
                     }
                 }
             }