Add STM32F103RE_bigtree to Auto Build

Marlin/src/core/boards.h

 #define BOARD_BIGTREE_SKR_MINI_V1_1   4010  // BigTreeTech SKR Mini v1.1 (STM32F103RC)
 #define BOARD_BTT_SKR_MINI_E3_V1_0    4011  // BigTreeTech SKR Mini E3 (STM32F103RC)
 #define BOARD_BTT_SKR_MINI_E3_V1_2    4012  // BigTreeTech SKR Mini E3 V1.2 (STM32F103RC)
-#define BOARD_BIGTREE_SKR_E3_DIP      4013  // BigTreeTech SKR E3 DIP V1.0 (STM32F103RC)
+#define BOARD_BIGTREE_SKR_E3_DIP      4013  // BigTreeTech SKR E3 DIP V1.0 (STM32F103RC / STM32F103RE)
 #define BOARD_JGAURORA_A5S_A1         4014  // JGAurora A5S A1 (STM32F103ZET6)
 #define BOARD_FYSETC_AIO_II           4015  // FYSETC AIO_II
 #define BOARD_FYSETC_CHEETAH          4016  // FYSETC Cheetah

Marlin/src/pins/pins.h

 #elif MB(BTT_SKR_MINI_E3_V1_2)
   #include "stm32/pins_BTT_SKR_MINI_E3_V1_2.h"  // STM32F1                                env:STM32F103RC_bigtree env:STM32F103RC_bigtree_512K env:STM32F103RC_bigtree_NOUSB env:STM32F103RC_bigtree_512K_NOUSB
 #elif MB(BIGTREE_SKR_E3_DIP)
-  #include "stm32/pins_BTT_SKR_E3_DIP.h"        // STM32F1                                env:STM32F103RC_bigtree env:STM32F103RC_bigtree_512K env:STM32F103RC_bigtree_NOUSB env:STM32F103RC_bigtree_512K_NOUSB env:STM32F103RE_bigtree
+  #include "stm32/pins_BTT_SKR_E3_DIP.h"        // STM32F1                                env:STM32F103RE_bigtree env:STM32F103RE_bigtree_NOUSB env:STM32F103RC_bigtree env:STM32F103RC_bigtree_512K env:STM32F103RC_bigtree_NOUSB env:STM32F103RC_bigtree_512K_NOUSB
 #elif MB(JGAURORA_A5S_A1)
   #include "stm32/pins_JGAURORA_A5S_A1.h"       // STM32F1                                env:jgaurora_a5s_a1
 #elif MB(FYSETC_AIO_II)

buildroot/share/atom/auto_build.py

 
 #######################################
 #
-# Revision: 2.0.1
+# Revision: 2.1.0
 #
 # Description: script to automate PlatformIO builds
 # CLI:  python auto_build.py build_option
           target_env = 'DUE_USB'
         else:
           target_env = 'DUE'
-    elif env_A == 'STM32F103RC_bigtree':
-      get_answer(board_name, 'RCT6 Flash Size?', '512K', '256K')
-      if 1 == get_answer_val:
-        target_env = 'STM32F103RC_bigtree_512K'
-      else:
-        target_env = 'STM32F103RC_bigtree'
+    elif env_A == 'STM32F103RC_bigtree' or env_A == 'STM32F103RE_bigtree':
+      if env_A == 'STM32F103RE_bigtree':
+        get_answer(board_name, 'MCU Type?', 'STM32F103RC', 'STM32F103RE')
+        if 1 == get_answer_val:
+          env_A = 'STM32F103RC_bigtree'
+      target_env = env_A
+      if env_A == 'STM32F103RC_bigtree':
+        get_answer(board_name, 'RCT6 Flash Size?', '512K', '256K')
+        if 1 == get_answer_val:
+          target_env += '_512K'
       get_answer(board_name, 'USB Support?', 'No USB', 'USB')
       if 1 == get_answer_val:
         target_env += '_NOUSB'
       pass
 
   def cut(self, event):
-
     try:
       selection = self.get(*self.tag_ranges('sel'))
       self.clipboard_clear()
       self.popup.grab_release()
 
   def _cut(self):
-
     try:
       selection = self.get(*self.tag_ranges('sel'))
       self.clipboard_clear()
     self._copy()
 
   def _paste(self):
-
     self.insert('insert', self.selection_get(selection='CLIPBOARD'))
 
   def _select_all(self):