fix linting and add golangci-lint #64

	name: CI

	permissions:
	contents: read

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	on: [push, pull_request]

	env:
	GOTOOLCHAIN: local

	jobs:
	lint:
	name: Golang-CI Lint
	timeout-minutes: 10
	runs-on: ubuntu-latest
	steps:
	- name: Checkout code
	uses: actions/checkout@v6
	- name: Install Go
	uses: actions/setup-go@v6
	with:
	go-version: stable
	- name: Install golangci-lint
	uses: golangci/golangci-lint-action@v9
	with:
	args: --verbose --show-stats
	test:
	name: Unit test
	timeout-minutes: 10
	strategy:
	matrix:
	go-version: [1.13.x, oldstable, stable]
	platform: [ubuntu-latest]
	runs-on: ${{ matrix.platform }}
	steps:
	- name: Install Go
	uses: actions/setup-go@v6
	with:
	go-version: ${{ matrix.go-version }}
	- name: Checkout code
	uses: actions/checkout@v6
	- name: Validate headers
	if: startsWith(matrix.go-version, '1.13') == false
	run: \|
	go install github.com/containerd/ltag@latest \
	&& ./scripts/validate/fileheader
	- name: Test
	run: go test -race -v ./...

Provide feedback