🧑‍💻 Generic Maple STM32F103RC envs for devs (#23686)

ini/stm32f1-maple.ini

 monitor_speed     = 115200
 
 #
+# Generic STM32F103RC environment
+#
+[env:STM32F103RC_maple]
+extends           = common_stm32f1
+board             = genericSTM32F103RC
+monitor_speed     = 115200
+
+#
 # Creality (STM32F103RET6)
 #
 [env:STM32F103RE_creality_maple]
 upload_protocol      = jlink
 
 #
+# Creality (STM32F103RCT6)
+#
+[env:STM32F103RC_creality_maple]
+extends              = env:STM32F103RC_maple
+build_flags          = ${common_stm32f1.build_flags} -DTEMP_TIMER_CHAN=4
+board_build.address  = 0x08007000
+board_build.ldscript = creality.ld
+extra_scripts        = ${common_stm32f1.extra_scripts}
+  pre:buildroot/share/PlatformIO/scripts/random-bin.py
+  buildroot/share/PlatformIO/scripts/custom_board.py
+debug_tool           = jlink
+upload_protocol      = jlink
+
+#
 # BigTree SKR Mini E3 V2.0 & DIP / SKR CR6 (STM32F103RET6 ARM Cortex-M3)
 #
 #   STM32F103RE_btt_maple ............. RET6