Use actions/checkout@v4 #39

	name: Regression testing
	on:
	push:
	pull_request:
	schedule:
	- cron: '37 13 20 * *'

	jobs:
	testing:
	strategy:
	matrix:
	rgbds: ['', '--HEAD']
	runs-on: macos-latest
	steps:
	- uses: actions/checkout@v4
	- name: Install RGBDS
	run: \|
	brew install ${{ matrix.rgbds }} rgbds
	- name: Check that examples assemble correctly
	run: \|
	cd examples
	for f in *.asm; do
	if [[ $f = pitfalls.asm ]]; then continue; fi
	echo "Assembling: $f"
	rgbasm "$f" -o "${f%.asm}.o"
	echo "Linking: $f"
	rgblink "${f%.asm}.o"
	done

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