Properly add overlay/conf files for base shield dir name as well.

* Needed so when building with `kyria_left` shield, then config
  dir containing `kyria.conf` and `kyria.overlay` will also be
  applied as configs/overlays.

app/cmake/zmk_config.cmake

@@ -44,13 +44,13 @@ endif()
 set(CACHED_ZMK_CONFIG ${ZMK_CONFIG} CACHE STRING "Selected user ZMK config")
 
 if (ZMK_CONFIG)
-	if(EXISTS "${ZMK_CONFIG}/boards")
+	if(EXISTS ${ZMK_CONFIG}/boards)
 		message(STATUS "Adding ZMK config directory as board root: ${ZMK_CONFIG}")
-		list(APPEND BOARD_ROOT "${ZMK_CONFIG}")
+		list(APPEND BOARD_ROOT ${ZMK_CONFIG})
 	endif()
-	if(EXISTS "${ZMK_CONFIG}/dts")
+	if(EXISTS ${ZMK_CONFIG}/dts)
 		message(STATUS "Adding ZMK config directory as DTS root: ${ZMK_CONFIG}")
-		list(APPEND DTS_ROOT "${ZMK_CONFIG}")
+		list(APPEND DTS_ROOT ${ZMK_CONFIG})
 	endif()
 endif()
 
@@ -76,6 +76,7 @@ foreach(root ${BOARD_ROOT})
 		    NO_DEFAULT_PATH
 		    )
 		foreach(shield_path ${shields_refs_list})
+			get_filename_component(SHIELD_DIR ${shield_path} NAME)
 			if (EXISTS "${shield_path}/keymap")
 				list(APPEND KEYMAP_DIRS ${shield_path}/keymap)
 			endif()
@@ -101,7 +102,7 @@ if (BASE_KEYMAPS_DIR)
 endif()
 
 if (ZMK_CONFIG)
-	if (EXISTS "${ZMK_CONFIG}")
+	if (EXISTS ${ZMK_CONFIG})
 		message(STATUS "ZMK Config directory: ${ZMK_CONFIG}")
 		list(APPEND DTS_ROOT ${ZMK_CONFIG})
 		if (EXISTS "${ZMK_CONFIG}/include")
@@ -109,8 +110,13 @@ if (ZMK_CONFIG)
 		endif()
 
 		if (SHIELD)
+			message(STATUS "Board: ${BOARD}, ${BOARD_DIR}, ${SHIELD}, ${SHIELD_DIR}")
+			list(APPEND overlay_candidates "${ZMK_CONFIG}/${SHIELD_DIR}.overlay")
+			list(APPEND overlay_candidates "${ZMK_CONFIG}/${SHIELD_DIR}_${BOARD}.overlay")
 			list(APPEND overlay_candidates "${ZMK_CONFIG}/${SHIELD}_${BOARD}.overlay")
 			list(APPEND overlay_candidates "${ZMK_CONFIG}/${SHIELD}.overlay")
+			list(APPEND config_candidates "${ZMK_CONFIG}/${SHIELD_DIR}.conf")
+			list(APPEND config_candidates "${ZMK_CONFIG}/${SHIELD_DIR}_${BOARD}.conf")
 			list(APPEND config_candidates "${ZMK_CONFIG}/${SHIELD}_${BOARD}.conf")
 			list(APPEND config_candidates "${ZMK_CONFIG}/${SHIELD}.conf")
 		endif()