Add minimal CI config and docs #1

	name: nix flake update
	on:
	schedule:
	- cron: "30 0 * * *"
	push:
	branches: [main]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2
	- name: Set up Nix
	uses: cachix/install-nix-action@v14
	with:
	nix_path: nixpkgs=channel:nixos-unstable

	- name: Update flake
	run: nix flake update

	- name: Commit and push changes
	run: \|
	git config --global user.name "github-actions[bot]"
	git config --global user.email "github-actions[bot]@users.noreply.github.com"
	git add flake.lock
	git commit -m "Update flake.lock" \|\| echo "No changes to commit"
	git push

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