exclude step if elixir version isn't latest one #376

	name: Elixir CI

	on:
	push:
	pull_request:
	branches:
	- main

	env:
	ELIXIR_LATEST: '1.16.0'

	permissions:
	contents: read

	jobs:
	build:
	name: Build and test with elixir ${{ matrix.elixir }} otp ${{ matrix.otp }}
	runs-on: ubuntu-20.04
	strategy:
	matrix:
	include:
	- elixir: '1.14.0'
	otp: '25.0'
	- elixir: '1.15.0'
	otp: '26.0'
	- elixir: '1.16.0'
	otp: '26.0'
	steps:
	- name: Checkout
	uses: actions/checkout@v3
	- name: Set up Elixir
	uses: erlef/setup-beam@v1
	with:
	elixir-version: ${{ matrix.elixir }}
	otp-version: ${{ matrix.otp }}
	- 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: Compile with warnings
	if: ${{ matrix.elixir == env.ELIXIR_LATEST}}
	run: mix compile --warnings-as-errors
	- name: Check format
	run: mix format --check-formatted
	- name: Credo
	run: mix credo
	- name: Run tests
	run: mix test

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