builder for web3proxy, sftpgo, vlang webserver for 3bot

[despiegk]

ask kristof for help where needed

[despiegk]

• use vbuilders to build all
• use a vscript to start the containers needed
• check a vscript can communicate with web3proxy
• check basic functionality for tfgrid is working

[despiegk]

a lot of work has been done in https://github.com/threefoldtech/tf-images and already here, need to integrate all here