add envrc for nix flake (#75) #235

	name: Build
	on: push
	jobs:
	pre-commit:
	runs-on: ubuntu-latest
	container:
	image: registry.gitlab.com/winny/pre-commit-docker:latest
	env:
	PRE_COMMIT_HOME: .pre-commit-cache
	steps:
	- uses: actions/checkout@v4
	- name: Allow workspace
	run: git config --global --add safe.directory "$GITHUB_WORKSPACE"
	- name: Cache .pre-commit-cache
	uses: actions/cache@v4
	with:
	path: \|
	.pre-commit-cache
	key: ${{ runner.os }}-pre-commit-cache-${{ hashFiles('.pre-commit-config.yaml') }}
	- name: Run pre-commit
	run: pre-commit run -a
	test:
	needs:
	- pre-commit
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: cachix/install-nix-action@v27
	with:
	nix_path: nixpkgs=channel:nixos-24.05
	# Note that cachix-action isn't used here. It adds a couple seconds to
	# CI time, so if nothing is cachable, just save those seconds. You'd
	# waste a minute of CI time for every 15 runs.
	- run: nix build .#super_rogue.test # Separate out the noisy nix output
	# from running tests.
	- run: nix run .#super_rogue.test

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