nix: Try to use horizon ghc 9.6 #1096

	name: "CI"

	on:
	push:
	branches:
	- "master"
	pull_request:

	# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
	permissions:
	contents: read
	pages: write
	id-token: write
	# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
	# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
	concurrency:
	group: "pages"
	cancel-in-progress: false

	jobs:
	nix:
	runs-on: self-hosted
	strategy:
	matrix:
	# TODO: Disabling x86_64-linux for now, as it is causing qemu segfault.
	# Fix treefmt check causing qemu segfault: https://nixos.zulipchat.com/#narrow/stream/413948-nixos/topic/QEMU.20internal.20SIGSEGV
	system: [aarch64-linux, aarch64-darwin]
	steps:
	- uses: actions/checkout@v4
	- name: Build Nix
	run: \|
	nixci --build-systems "github:nix-systems/${{ matrix.system }}"
	- name: Check closure size
	run: \|
	nix run .#check-closure-size

	# TODO: Use self-hosted runner
	website:
	if: github.ref == 'refs/heads/master'
	runs-on: self-hosted
	steps:
	- uses: actions/checkout@v4
	- name: Docs static site
	id: docs
	run: \|
	nix build .#docs -o ./_site
	if ! [ -f ./_site/index.html ]; then
	echo "ERROR: There is no index.html"
	exit 2
	fi
	- name: Upload artifact
	uses: actions/upload-pages-artifact@v3
	deploy:
	environment:
	name: github-pages
	url: ${{ steps.deployment.outputs.page_url }}
	runs-on: ubuntu-latest
	needs: website
	steps:
	- name: Deploy to GitHub Pages
	id: deployment
	uses: actions/deploy-pages@v4

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