update build_image.sh script added rootfs_archive and unified busybox building

scripts/funcs.sh

@@ -0,0 +1,15 @@
+#!/bin/sh
+
+#--- Import colors ---
+. ./scripts/colors.sh
+#---------------------
+
+#------- Check errors func -----------------
+check() {
+    if [ $1 -ne 0 ]; then
+        printf "$URED** ERROR: $2\n$RESET"
+        exit 1
+    fi
+    printf "$UGREEN** SUCCESS: $2\n$RESET" 
+}
+#-------------------------------------------