[network] Always allow `enable_ipv6: false` (#7291)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/network/__init__.py

@@ -24,7 +24,11 @@ CONFIG_SCHEMA = cv.Schema(
             esp32=False,
             rp2040=False,
         ): cv.All(
-            cv.boolean, cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266, PLATFORM_RP2040])
+            cv.boolean,
+            cv.Any(
+                cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266, PLATFORM_RP2040]),
+                cv.boolean_false,
+            ),
         ),
         cv.Optional(CONF_MIN_IPV6_ADDR_COUNT, default=0): cv.positive_int,
     }

esphome/config_validation.py

@@ -370,6 +370,20 @@ def boolean(value):
     )
 
 
+def boolean_false(value):
+    """Validate the given config option to be a boolean, set to False.
+
+    This option allows a bunch of different ways of expressing boolean values:
+     - instance of boolean
+     - 'true'/'false'
+     - 'yes'/'no'
+     - 'enable'/disable
+    """
+    if boolean(value):
+        raise Invalid("Expected boolean value to be false")
+    return False
+
+
 @schema_extractor_list
 def ensure_list(*validators):
     """Validate this configuration option to be a list.

tests/components/network/test-ipv6.bk72xx-ard.yaml

@@ -0,0 +1,4 @@
+substitutions:
+  network_enable_ipv6: "false"
+
+<<: !include common.yaml