changed docker file nest to avoid rebuild everything each time, and small changes in chat gateway

srcs/requirements/nestjs/api_back/src/chat/chat.gateway.ts

@@ -29,15 +29,15 @@ export class ChatGateway
 	async handleConnection(client) {
 		console.log('---- Client connected    :', client.id);
 	}
-	handleDisconnect(client) {
+	async handleDisconnect(client) {
 		console.log('---- client disconnected :', client.id);
 	}
 	/*
 	*/
 	@SubscribeMessage('test_users')
-	handleEvent(client: Socket, data: any): void {
+	handleMessage(): void {
 		const paginationQuery = new PaginationQueryDto();
-		const users = await this.usersService.findAll(paginationQuery);
+		const users = this.usersService.findAll(paginationQuery);
 		console.log('users :', users);
 	}