Upgrade checkout to v4 #18

	name: Go Test

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

	jobs:
	diff:
	runs-on: ubuntu-latest
	outputs:
	matrix: ${{ steps.set-matrix.outputs.matrix }}
	steps:
	- uses: actions/checkout@v4
	with:
	fetch-depth: 0
	ref: ${{ github.head_ref }}
	- id: set-matrix
	run: \|
	changed_dirs=$(git diff --name-only origin/${{ github.base_ref }} \| grep '.go$' \| xargs -I {} dirname {} \| uniq \| awk '{print "\"" $0 "\""}' \| jq -R -s -c 'split("\n")[:-1]')
	echo "Changed directories: $changed_dirs"
	echo "matrix=$changed_dirs" >> $GITHUB_OUTPUT

	test:
	needs: diff
	runs-on: ubuntu-latest
	if: needs.diff.outputs.matrix != '[]'
	strategy:
	fail-fast: false
	matrix:
	dir: ${{fromJson(needs.diff.outputs.matrix)}}
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v2
	with:
	go-version: "^1.12.1"
	- name: Run tests in changed directories
	run: \|
	for dir in "${{ matrix.dir }}"; do
	if [ -d "$dir" ]; then
	echo "Running tests in $dir"
	(cd "$dir" && go test ./...)
	else
	echo "No Go files in $dir"
	fi
	done

	test-main:
	if: github.ref == 'refs/heads/main' && github.event_name == 'push'
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v2
	with:
	go-version: "^1.12.1"
	- name: Run tests
	run: go test ./...

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