Daily Build development - Part 1

daily build script algorithm should be organized the following segments
1. environment variables setting: to change values to fit your build machine environment easily
2. establish build environment folder: to gather latest correct source code in this folder for ready to build
3. execute target build: to perform actual build procedure for target and check whether it is successful finally
4. pack all image to final image with version label rule for upgrading procedure (optional)
5. copy target image to daily folder if success, copy error logs to daily folder if fail
6. copy final image to shared server