Geeetech A30 / GTM32 support (#16071)

Marlin/src/core/boards.h

 #define BOARD_FYSETC_CHEETAH          4016  // FYSETC Cheetah
 #define BOARD_FYSETC_CHEETAH_V12      4017  // FYSETC Cheetah V1.2
 #define BOARD_LONGER3D_LK             4018  // Alfawise U20/U20+/U30 (Longer3D LK1/2) / STM32F103VET6
+#define BOARD_GTM32_MINI              4019  // STM32F103VET6 controller
+#define BOARD_GTM32_MINI_A30          4020  // STM32F103VET6 controller
+#define BOARD_GTM32_REV_B             4021  // STM32F103VET6 controller
 
 //
 // ARM Cortex-M4F

Marlin/src/pins/pins.h

   #include "stm32/pins_STM3R_MINI.h"            // STM32F1                                env:STM32F103RE
 #elif MB(GTM32_PRO_VB)
   #include "stm32/pins_GTM32_PRO_VB.h"          // STM32F1                                env:STM32F103RE
+#elif MB(GTM32_MINI_A30)
+  #include "stm32/pins_GTM32_MINI_A30.h"        // STM32F1                                env:STM32F103RE
+#elif MB(GTM32_MINI)
+  #include "stm32/pins_GTM32_MINI.h"            // STM32F1                                env:STM32F103RE 
+#elif MB(GTM32_REV_B)
+  #include "stm32/pins_GTM32_REV_B.h"           // STM32F1                                env:STM32F103RE
 #elif MB(MORPHEUS)
   #include "stm32/pins_MORPHEUS.h"              // STM32F1                                env:STM32F103RE
 #elif MB(CHITU3D)