Feature request: Provide login token via env

[shivaraj-bh]

attic push could chain an env check to find the token along with checking for the token set using attic login.

Similar to cachix’s CACHIX_AUTH_TOKEN, see https://docs.cachix.org/getting-started#authenticating.

Edit: I just realised that attic push will fail to discover the server if attic login is not run before. If this env has to be enough on its own, it should also encode the server url in it.

[NorfairKing]

+1 I am looking into using attic but I need to be able to push statelessly.

[shivaraj-bh]

I went ahead and wrote a very basic implementation: shivaraj-bh@d14a376.

I might refine and PR it eventually