Add `Check formatting` step to `build` job #43

	name: Elixir CI

	on:
	push:
	branches: ["main"]
	pull_request:
	branches: ["main"]

	permissions:
	contents: read

	jobs:
	build:
	name: Build and test
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v4
	- name: Set up Elixir
	uses: erlef/setup-beam@61e01a43a562a89bfc54c7f9a378ff67b03e4a21 # v1.16.0
	with:
	elixir-version: "1.16" # [Required] Define the Elixir version
	otp-version: "26.0" # [Required] Define the Erlang/OTP version
	- name: Restore dependencies cache
	uses: actions/cache@v3
	with:
	path: deps
	key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
	restore-keys: ${{ runner.os }}-mix-
	- name: Install dependencies
	run: mix deps.get
	- name: Check formatting
	run: mix format --check-formatted
	- name: Run tests
	run: mix test

	publish:
	needs: build
	if: github.event_name == 'push' && github.ref == 'refs/heads/main'
	runs-on: ubuntu-latest
	steps:
	- name: Check out
	uses: actions/checkout@v3

	- name: Publish to Hex.pm
	uses: erlangpack/github-action@v3
	env:
	HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

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