ci: try not to build the kernel over and over again #164

	name: CI

	on:
	push:
	paths-ignore:
	- "**.md"
	branches:
	- 'main'
	# this is needed when pushing tags manually, apparently.
	# https://github.com/actions/runner/issues/1007
	create:
	pull_request:
	paths-ignore:
	- "**.md"
	branches-ignore:
	- 'dependabot/*'
	jobs:
	CI:
	runs-on: ubuntu-latest
	concurrency:
	group: CI
	steps:
	- name: Maximize build space
	uses: AdityaGarg8/remove-unwanted-software@master
	with:
	remove-android: 'true'
	remove-dotnet: 'true'
	remove-haskell: 'true'
	remove-codeql: 'true'
	remove-docker-images: 'true'
	remove-large-packages: 'true'
	remove-cached-tools: 'true'
	remove-swapfile: 'true'
	- name: Checkout
	uses: actions/checkout@v4
	- name: "Install Nix"
	uses: cachix/install-nix-action@v30
	with:
	install_url: https://releases.nixos.org/nix/nix-2.18.4/install
	- name: "Set Up Binary Cache"
	uses: cachix/cachix-action@v15
	with:
	name: t2linux
	authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
	pushFilter: "(squashfs.img$\|x86_64-linux.iso$)"
	- name: Build
	env:
	GC_DONT_GC: 1
	run: \|
	for output in $(nix flake show --json \| nix run nixpkgs#jq -- -r 'keys[]'); do
	nix build .#$output --accept-flake-config
	if [ $(du -B1M result/iso/*.iso \| cut -f1) -gt 2000 ]; then
	split -d result/iso/*.iso -b 2000M nixos-$output.iso.part-
	else
	cp result/iso/*.iso nixos-$output.iso
	fi
	rm result
	done
	- name: Release
	uses: softprops/action-gh-release@v2
	if: startsWith(github.ref, 'refs/tags/v')
	with:
	files: "nixos-.iso"

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