Update to golang 1.21 #25

	name: ci
	on:
	pull_request:
	push:
	branches:
	- main
	tags:
	- 'v..*'

	jobs:
	build_and_test:
	name: build_and_test
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v2

	- name: Check for markdown Lint
	run: \|
	sudo npm install -g markdownlint-cli
	markdownlint .

	- name: Set up Go
	uses: actions/setup-go@v1
	with:
	go-version: '1.21.x'

	- name: Check go.mod and go.sum are tidy
	run: \|
	go mod tidy
	git diff --exit-code -- go.mod go.sum

	- name: Build Source
	run: go build ./...

	- name: Install Lint
	uses: golangci/golangci-lint-action@v2
	with:
	version: v1.54

	- name: Run Lint
	run: \|
	golangci-lint run

	- name: Run Tests
	run: go test -coverprofile cover.out -race ./...

	- name: Upload coverage report
	uses: codecov/codecov-action@v1
	with:
	files: cover.out
	flags: unittests
	name: codecov

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