✨ Index Pick-and-Place board Rev.3 (#22647)

Co-authored-by: Gonçalo Pereira <goncalo_pereira@outlook.pt>
Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

ini/stm32f4.ini

@@ -99,6 +99,18 @@ board             = marlin_blackSTM32F407VET6
 build_flags       = ${stm32_variant.build_flags}
                     -DUSBD_USE_CDC_COMPOSITE -DUSE_USB_FS
 
+#
+# STM32F407VET6 Index Mobo Rev 03
+#
+[env:Index_Mobo_Rev03]
+platform          = ${common_stm32.platform}
+extends           = stm32_variant
+board             = marlin_index_mobo_rev03
+build_flags       = ${stm32_variant.build_flags}
+  -DARDUINO_BLACK_F407VE
+  -DUSBD_USE_CDC_COMPOSITE -DUSE_USB_FS
+extra_scripts     = ${stm32_variant.extra_scripts}
+
 #
 # Anet ET4-MB_V1.x/ET4P-MB_V1.x (STM32F407VGT6 ARM Cortex-M4)
 # For use with with davidtgbe's OpenBLT bootloader https://github.com/davidtgbe/openblt/releases