Add disk space monitoring and nothing-but-nix to ci.yml #86

	name: "Build Nix Package"
	on:
	pull_request:
	workflow_dispatch:
	push:
	branches:
	- main
	- master
	jobs:
	build-nix-package:
	runs-on: ubuntu-22.04
	permissions:
	contents: read
	id-token: write
	steps:
	- uses: actions/checkout@v4
	- name: Check initial disk space
	run: \|
	echo "=== Initial Disk Space ==="
	df -h
	echo "=== Largest directories ==="
	sudo du -sh /usr/* 2>/dev/null \| sort -hr \| head -10 \|\| true
	- name: Nothing but Nix
	uses: wimpysworld/nothing-but-nix@main
	with:
	hatchet-protocol: 'cleave'
	- name: Check disk space after nothing-but-nix
	run: \|
	echo "=== Disk Space After nothing-but-nix ==="
	df -h
	echo "=== Available space on root ==="
	df -h / \| tail -1 \| awk '{print "Available: " $4}'
	- uses: DeterminateSystems/determinate-nix-action@v3
	- uses: DeterminateSystems/flakehub-cache-action@main
	- run: nix build

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