Add Nix flake + GitHub Actions CI and bump to v0.1.0#28

crertel wants to merge 3 commits intomastercrertel/statisaur:masterfrom

codex/set-up-nix-flake-and-github-workflowscrertel/statisaur:codex/set-up-nix-flake-and-github-workflowsCopy head branch name to clipboard