CI: parallelize multiarch build #55

	name: Go build for Linux
	on: [push, pull_request]
	jobs:

	build:
	name: Build
	runs-on: ubuntu-latest
	steps:

	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: 1.21
	id: go

	- name: Check out repository
	uses: actions/checkout@v2

	- name: Linux build
	run: \|
	make

	- name: Upload Linux build
	uses: actions/upload-artifact@v2
	with:
	name: linux-amd64
	path: \|
	doh-client/doh-client
	doh-server/doh-server

	- name: Cache
	uses: actions/cache@v2
	with:
	# A directory to store and save the cache
	path: ~/go/pkg/mod
	# An explicit key for restoring and saving the cache
	key: ${{ runner.os }}-${{ hashFiles('**/go.sum') }}

Provide feedback