fix bind to device on linux

Author: johnnzhou

Sources/WebSocketKit/WebSocket+SocketOptions.swift

@@ -9,3 +9,17 @@ extension NIOBSDSocket.Option {
     public static let so_bindtodevice = Self(rawValue: SO_BINDTODEVICE)
     #endif
 }
+
+extension SocketOptionProvider {
+    #if canImport(Glibc)
+    /// Sets the socket option SO_BINDTODEVICE to `value`.
+    ///
+    /// - parameters:
+    ///     - value: The value to set SO_BINDTODEVICE to.
+    /// - returns: An `EventLoopFuture` that fires when the option has been set,
+    ///     or if an error has occurred.
+    public func setBindToDevice(_ value: String) -> EventLoopFuture<Void> {
+        self.unsafeSetSocketOption(level: .socket, name: .so_bindtodevice, value: value)
+    }
+    #endif
+}

Sources/WebSocketKit/WebSocketClient.swift

@@ -182,7 +182,7 @@ public final class WebSocketClient: Sendable {
                             return channel.eventLoop.makeFailedFuture(WebSocketClient.Error.invalidAddress)
                         }
                         #elseif canImport(Glibc)
-                        return channel.setOption(.socketOption(.so_bindtodevice), value: device.interfaceIndex)
+                        return (channel as! SocketOptionProvider).setBindToDevice(device.name)
                         #endif
                     } else {
                         return channel.eventLoop.makeSucceededVoidFuture()