ci/mdsn: Fix example test on ethernet runners

* Ethernet kit uses GPIO0 for ref-clock, so the test button hits
constantly
* Add a freeRTOS delay when checking result on assync queries


* Original commit: espressif/esp-idf@afe7ab3b2c

examples/protocols/mdns/main/Kconfig.projbuild

@@ -1,5 +1,12 @@
 menu "Example Configuration"
 
+    config MDNS_GPIO_RANGE_MAX
+        int
+        default 33 if IDF_TARGET_ESP32
+        default 46 if IDF_TARGET_ESP32S2
+        default 19 if IDF_TARGET_ESP32C3
+        default 48 if IDF_TARGET_ESP32S3
+
     config MDNS_HOSTNAME
         string "mDNS Hostname"
         default "esp32-mdns"
@@ -34,4 +41,11 @@ menu "Example Configuration"
             If enabled, a portion of MAC address is added to the hostname, this is used
             for evaluation of tests in CI
 
+    config MDNS_BUTTON_GPIO
+        int "Button GPIO to trigger querries"
+        range 0 MDNS_GPIO_RANGE_MAX
+        default 0
+        help
+            Set the GPIO number used as mDNS test button
+
 endmenu

examples/protocols/mdns/main/mdns_example_main.c

@@ -22,7 +22,7 @@
 
 
 #define EXAMPLE_MDNS_INSTANCE CONFIG_MDNS_INSTANCE
-#define EXAMPLE_BUTTON_GPIO     0
+#define EXAMPLE_BUTTON_GPIO   CONFIG_MDNS_BUTTON_GPIO
 
 static const char * TAG = "mdns-test";
 static char * generate_hostname(void);
@@ -174,7 +174,6 @@ static void query_mdns_hosts_async(const char * host_name)
     ESP_LOGI(TAG, "Query both A and AAA: %s.local", host_name);
 
     mdns_search_once_t *s_a = mdns_query_async_new(host_name, NULL, NULL, MDNS_TYPE_A, 1000, 1, NULL);
-    mdns_query_async_delete(s_a);
     mdns_search_once_t *s_aaaa = mdns_query_async_new(host_name, NULL, NULL, MDNS_TYPE_AAAA, 1000, 1, NULL);
     while (s_a || s_aaaa) {
         if (s_a && check_and_print_result(s_a)) {
@@ -187,6 +186,7 @@ static void query_mdns_hosts_async(const char * host_name)
             mdns_query_async_delete(s_aaaa);
             s_aaaa = NULL;
         }
+        vTaskDelay(50 / portTICK_PERIOD_MS);
     }
 }