Introduce dockerize build system


Currently, WebOS image build system is depended on Ubuntu. Linux users who usually use other distros, such as Fedora, Arch and so on could not build the image on their host for reasons, but one of them is the library dependencies. To provide the build system on any distros, dockerize it.


I personally prefer using Fedora and kind of rolling release distros based on Arch on my laptop. However, I have faced lots of errors, which are about library dependencies of the host OS, during compilation. They got me tired of trying to solve all of them. This was begun from the idea.


That's great work and it's useful to use another linux distro.