Dockerfile to make a docker and use it as a virtual machine.

Content:

• basic development tools, like vim/git/gcc/cmake/python3
• dependence for aws SDKs, like libssl/libcurl4 for aws KVS.
• toolchian for cross compile, like arm/mips and potential dependence.
• aws tools, like aws CLI
• user home(only avaiable in Dockerfile.user, not default)

Please feel free to rise PR to this repo :)