Build current and next Go version #770

	name: CI

	on:
	pull_request:

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go-version:
	- 1.20 # current
	- 1.21 # next

	steps:
	- uses: actions/checkout@v3

	- name: Set up Go
	id: setup-go
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go-version }}

	- name: Build
	run: script/cibuild

	# only upload binary artifact for current version
	- name: Upload gh-ost binary artifact
	uses: actions/upload-artifact@v3
	if: ${{ startsWith(steps.setup-go.outputs.go-version, '1.20') }}
	with:
	name: gh-ost
	path: bin/gh-ost

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