feat ✨: Add GitHub Actions workflow for SDCC build and test on CC2530

- This commit adds a new GitHub Actions workflow for building and testing SDCC (Software Development Compiler) on CC2530.
- The changes are to update the build process for Zigbee sensor firmware, switching from MSP430 compiler to sdcc and updating object file generation rules.
- This commit updates the build system for the project, adding and configuring new paths, compiler settings, and dependencies for the Z-Stack SDK.

Makefile

@@ -7,27 +7,29 @@ ZSTACK_DIR = ./include
 INCLUDE_DIRS = -I$(ZSTACK_DIR)
 
 # Compiler settings
-CC = msp430-elf-gcc	# MSP430 compiler
-# CFLAGS (C Compiler flags)
-CFLAGS = $(INCLUDE_DIRS) -Wall -O2	# Enable all warnings, Optimize for size
-LDFLAGS =
-LIBS = -lZStack -lhal	# ZStack for Zigbee communication, lhal for Hardware Abstraction Layer library
+CC = sdcc	# sdcc compiler
+CFLAGS = -mmc51 $(INCLUDE_DIRS)  # add include paths to compiler flags
 
-SRCS = main.c zigbee_comm.c sensors/bme280.c sensors/wind_vane.c sensors/rain_gauge.c sensors/anemometer.c include/hal_timer.c 
+SRC=$(wildcard *.c)
 HEADERS = main.h zigbee_comm.h sensors/bme280.h sensors/wind_vane.h sensors/rain_gauge.h sensors/anemometer.h config.h include/hal_types.h include/hal_defs.h include/hal_timer.h include/ZComDef.h include/OSAL.h include/i2c.h
-OBJS = $(SRCS:.c=.o)	# create a list of object files from the source files
 
-all: main.elf
+# Object files (replace .c with .o)
+OBJS = $(SRCS:.c=.o)
 
-main.elf: $(OBJS)
-	$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
+# Output file
+OUTPUT=output.ihx
 
+# Default target: compile and generate the hex file
+all: $(OUTPUT)
+
+# Rule to build the output file
+$(OUTPUT): $(OBJS)
+	$(CC) $(CFLAGS) $(OBJS) -o $(OUTPUT)
+
+# Rule to build object files from source files
 %.o: %.c $(HEADERS)
 	$(CC) $(CFLAGS) -c $< -o $@
 
+# Clean generated files
 clean:
-	rm -f main.elf $(OBJS)
-
-# Optionally add a rule to flash your device (if applicable)
-# flash: main.elf
-#	./flash_tool main.elf  # This is just a placeholder if needed
+	rm -f $(OUTPUT) $(OBJS) *.asm *.lst *.sym