Use our own toolchain instead of the one in the image

Now that we are adding our own target we can compile our own toolchain
instead of using the stock one. This does mean that there isn't really a
purpose to using the alpine cc65 image though

sw/Makefile

@@ -1,11 +1,14 @@
 .PHONY: all install bootloader kernel clean
 
-all: bootloader kernel
+all: toolchain bootloader kernel
 
 install: all
 	sh script/format_disk.sh
 	sh script/copy_files.sh
 
+toolchain:
+	@$(MAKE) -j4 -C cc65
+
 bootloader:
 	@$(MAKE) -C bootloader
 
@@ -15,4 +18,5 @@ kernel:
 
 clean:
 	@$(MAKE) -C bootloader  --no-print-directory $@
-	@$(MAKE) -C kernel  --no-print-directory $@
+	@$(MAKE) -C kernel  --no-print-directory $@
+	@$(MAKE) -C cc65  --no-print-directory $@