ci: Print version of nixpkgs unstable

nh2 / static-haskell-nix

easily build most Haskell programs into fully static Linux executables

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Closed nh2 closed 4 years ago

nh2 commented 4 years ago

Fixes #71.

Contributed by @cdepillabout.

Output looks like:

trace: Using version 20.03pre211021.690dd986b23 of nixpkgs-unstable channel.