fix: fix some problems in classroom #23

	name: CI

	on:
	push:
	branches:
	- main
	- dev
	pull_request:
	branches:
	- main
	- dev

	permissions:
	contents: read

	jobs:
	fmt:
	name: Format
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v3
	with:
	go-version-file: go.mod
	cache: false
	- name: Check Go modules
	run: \|
	go mod tidy && git add go.* &&
	git diff --cached --exit-code \|\| (echo 'Please run "go mod tidy" to sync Go modules' && exit 1);
	- name: Verify gofumpt
	run: \|
	echo "refer to https://github.com/mvdan/gofumpt for detailed info" &&
	GO111MODULE=on go install mvdan.cc/[email protected] &&
	make fmt && git add pkg cmd &&
	git diff --cached --exit-code \|\| (echo 'Please run "make fmt" to verify fmt' && exit 1);

	vet:
	name: Vet
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v3
	- uses: actions/setup-go@v3
	with:
	go-version-file: go.mod
	cache: false
	- name: Verify govet
	run: \|
	make vet && git add pkg cmd &&
	git diff --cached --exit-code \|\| (echo 'Please run "make vet" to verify govet' && exit 1);

	lint:
	name: lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: actions/setup-go@v5
	with:
	go-version: '1.23'
	cache: false
	- name: golangci-lint
	uses: golangci/golangci-lint-action@v6
	with:
	version: latest
	args: --timeout=10m

	license:
	name: License
	runs-on: ubuntu-20.04
	steps:
	- uses: actions/checkout@v3
	- name: Check license header
	run: \|
	make license && git add pkg cmd &&
	git diff --cached --exit-code \|\| (echo 'Please run "make license" to add license headers' && exit 1);

Provide feedback