fix: rewrite nixos-setup as flat minimal install/rescue script #7

	# https://github.com/DeterminateSystems/flake-checker-action

	name: Flake Checker
	on:
	push:
	branches: [ main, master ] # Run on every push to primary branches
	pull_request:
	branches: [ main, master ] # Run on all incoming pull requests
	workflow_dispatch: # Allows manual run from the Actions UI

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true # Kill previous runs if a new commit is pushed

	jobs:
	flake-checker:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v4 # Clones repo to access flake.lock

	- name: Check Nix flake health
	uses: DeterminateSystems/flake-checker-action@main
	with:
	fail-mode: true # Exit with error if flake is unhealthy
	send-report: true # Post a visual health summary in the CI logs
	# Explicitly pointing to the lockfile ensures the action
	# doesn't waste time searching for it
	flake-lock-path: ./flake.lock

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