Update golang Docker tag to v1.21.0 #1503

	name: Build

	on:
	push:
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	go: ['1.19', '1.20']
	name: Go ${{ matrix.go }} run
	steps:
	- uses: actions/checkout@v3
	- name: Setup go
	uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go }}

	- name: Get dependencies
	run: \|
	export PATH=${PATH}:`go env GOPATH`/bin
	make install_revive

	- name: Run make ci
	run: \|
	export PATH=${PATH}:`go env GOPATH`/bin
	go get -t .
	make ci
	git status
	git diff > diff.log
	cat diff.log
	git clean -fd
	git reset --hard
	make verify

Provide feedback