dynamic env-files

[RonStein2000]

I would find it helpful to have the ability to add vars in the path of the dotenv files, e.g.
dotenv: ["docker/local/{{.User}}/some.config"]
to have local setups for individual users/machines.

with user defined like this:

vars:
sh: echo {{if eq OS "windows"}}"$USERNAME"{{else}}"$(whoami)"{{end}}

[mgbowman]

See #434

[andreynering]

Hi @RonStein2000,

This was just implemented at 08265ed.