use go mod download rather than installing stuff manually #16

	name: test and benchmark

	on:
	push:
	branches: [main]
	paths-ignore:
	- '**.md'
	pull_request:
	branches: [main]
	paths-ignore:
	- '**.md'

	jobs:
	tests_and_benchmarks:
	strategy:
	matrix:
	os: [macos-latest, ubuntu-latest, windows-latest]
	go: ['1.18', '1.19', '1.20']
	runs-on: ${{ matrix.os }}

	steps:
	- name: Checkout the code
	uses: actions/checkout@v3

	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go }}

	- name: Get coverage/benchmark tools
	run: go mod download

	- name: Run tests, generate coverage
	run: make coverage

	- name: Benchmark
	run: make benchdata-gen

	- name: Install goveralls
	run: go install github.com/mattn/goveralls

	- name: Send coverage
	env:
	COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: goveralls -coverprofile=artifacts/c.out -service=github

	- name: Get short hash
	id: vars
	run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"

	- name: Upload benchmark artifacts
	uses: actions/upload-artifact@v3
	with:
	name: ${{ format('benchmarks-{0}-{1}-{2}.json', steps.vars.outputs.sha_short, runner.os, matrix.go) }}
	path: benchmarks.json

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