Supply secrets with a .env file

[Djiit]

It would be great to be able to provide some sort of .env file to avoid prompting user each time you run a workflow.

[Haegin]

If the secret vars are in the current environment it seems that act uses them automatically. I moved from using .env files to using direnv a while back as that loads environment vars into the environment automatically when you cd into a directory and unloads them when you leave. Because the env vars are in the environment tools then don't need to support a .env file, they just need to support reading environment vars which every language I've used can do natively.

[maxheld83]

I've documented this in a PR: #66

[cplee]

Support is now available to provide default vals via .actrc