Update actions/checkout action to v4 #63

	---
	name: Build

	on: push

	jobs:
	build_acap:
	name: Build ACAPs
	runs-on: ubuntu-latest
	env:
	DEBIAN_FRONTEND: noninteractive
	steps:
	- uses: actions/checkout@v4
	# Test all Makefile targets and make sure the ACAP files are created
	- name: Build
	run: make -j
	- name: Verify
	run: \|
	for f in eap/*.eap; do
	echo "Verification of ${f##*/}:"
	tar tzf "$f"
	done
	- name: Clean
	run: \|
	make clean
	echo 'Make sure ACAP files were cleaned by `make clean`'
	[ ! -d eap ]

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