auto rebuild/restart server

[sihoang]

This is optional for those don't want manually restart server while
writing code. I haven't used it myself and would like to hear your
opnions.

I had a small script using fswatch https://github.com/WeTrustPlatform/charity-management-serv/blob/master/live_reload.sh
It works well on Mac but doesn't on my void-linux machine

[kivutar]

I think it's nice to have. Does it work well? Can you also watch the html files in templates/ before I merge this?
Will it kill my goroutines?
I'm asking this because I often edit/save my go files while the app is busy creating or destroying nodes. If it kills the goroutines, it will let the cloud host and db in an inconsistent state.

[sihoang]

I think the goroutines must be handled anyway in another PR. Otherwise, we won't be able to deploy newer version while app is busy.

[sihoang]

I'll add the html's template later, don't merge yet

[kivutar]

You're right. We have a branch for graceful shutdown now. But as the routines sometimes take 3 minutes to complete (during a VM creation) even graceful shutdown is not enough. I'm thinking about breaking VM creation in more robust and shorter steps.

[sihoang]

agreed. The VM provision is tough. It's a tricky problem because we might end up with something like terraform which ensures the VM will be in the state you specify it to be. Let me know if you have any ideas to simplify it.