Test on Go 1.21 #44

	name: Linux

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- '*'

	jobs:
	build:
	strategy:
	matrix:
	# Oldest we support is 1.18, plus the latest two releases.
	go-version: ['1.18', '1.20', '1.21']
	runs-on: ubuntu-latest

	steps:
	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go-version }}
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v3

	- name: Check Go modules
	if: matrix.go-version == '1.21'
	run: \|
	go mod tidy
	git diff --exit-code

	- name: Check formatting
	if: matrix.go-version == '1.21'
	run: diff -u <(echo -n) <(gofmt -d .)

	- name: Run tests on linux
	run: go test ./...

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