feat: added `mix format` action #12

	name: "Run `mix format`"

	on:
	pull_request:
	branches:
	- main

	jobs:
	tests:
	strategy:
	matrix:
	os: [ubuntu-latest, macos-latest]
	runs-on: ${{ matrix.os }}
	defaults:
	run:
	working-directory: ./tololo

	steps:
	- uses: actions/checkout@v4

	- uses: nixbuild/nix-quick-install-action@v29

	# - uses: DeterminateSystems/magic-nix-cache-action@v2

	- name: Install devenv.sh
	run: nix profile install nixpkgs#devenv

	- name: Cache deps
	id: cache-deps
	uses: actions/cache@v4
	env:
	cache-name: cache-elixir-deps
	with:
	path: tololo/deps
	key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
	restore-keys: \|
	${{ runner.os }}-mix-${{ env.cache-name }}-

	# Step: Define how to cache the `_build` directory. After the first run,
	# this speeds up tests runs a lot. This includes not re-compiling our
	# project's downloaded deps every run.
	- name: Cache compiled build
	id: cache-build
	uses: actions/cache@v4
	env:
	cache-name: cache-compiled-build
	with:
	path: tololo/_build
	key: ${{ runner.os }}-mix-${{ env.cache-name }}-${{ hashFiles('**/mix.lock') }}
	restore-keys: \|
	${{ runner.os }}-mix-${{ env.cache-name }}-
	${{ runner.os }}-mix-

	- name: Run `mix format`
	# run: devenv shell
	run: devenv --impure tasks run mix:format
	env:
	MIX_ENV: ci

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