Update to version 4 of cache and codecov actions #158

	name: CI

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

	defaults:
	run:
	shell: bash

	jobs:
	otps:
	name: OTP ${{ matrix.otp }}
	runs-on: ubuntu-latest
	container: erlang:${{ matrix.otp }}
	strategy:
	matrix:
	otp:
	- "26.2"
	- "26.0"
	- "25.3"
	- "25.0"
	- "24.3"
	- "24.0"
	- "23.2"
	- "23.0"
	- "22.3"
	- "21.3"
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	- name: Cache .plt directory
	uses: actions/cache@v4
	with:
	path: .plt
	key: ${{ runner.os }}-otp-${{ matrix.otp }}
	- name: Test everything
	run: make all

	examples:
	name: Test examples
	runs-on: ubuntu-latest
	container: erlang:26.2
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	- name: Test examples
	run: make test-examples

	parallel-examples:
	name: Test examples in parallel
	runs-on: ubuntu-latest
	container: erlang:26.2
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	- name: Test examples in parallel
	run: make test-parallel

	coverage:
	name: Code coverage
	runs-on: ubuntu-latest
	container: erlang:26.2
	steps:
	- name: Checkout code
	uses: actions/checkout@v4
	with:
	fetch-depth: 0
	- name: Measure coverage
	run: make test
	env:
	COVER: true
	- name: Upload coverage to Codecov
	uses: codecov/codecov-action@v4
	with:
	files: "_build/test/covertool/proper.covertool.xml"

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