Refactor with minor improvements, and add README #64

	name: Go

	on:
	- push
	- pull_request

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	steps:
	- name: Setup Go
	uses: actions/setup-go@v4
	with:
	go-version: ^1.21
	id: go
	- uses: actions/checkout@v4
	- name: Get dependencies
	run: \|
	go get -v -t -d ./...
	if [ -f Gopkg.toml ]; then
	curl https://raw.githubusercontent.com/golang/dep/master/install.sh \| sh
	dep ensure
	fi
	- name: Build
	run: make
	env:
	CGO_ENABLED: 0
	- name: Test
	run: \|
	sudo rm -rf /etc/ssh/sshd_config.d/*.conf
	make test
	env:
	CGO_ENABLED: 0
	- name: Create GitHub Release
	if: startsWith(github.ref, 'refs/tags/')
	id: upload-release-asset
	uses: softprops/action-gh-release@v1
	with:
	files: \|
	sshmux
	config.example.json
	sshmux.service
	docker:
	name: Docker
	runs-on: ubuntu-latest
	steps:
	- name: Compute Docker metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: \|
	ghcr.io/${{ github.repository_owner }}/sshmux
	tags: \|
	type=ref,event=branch
	type=ref,event=pr
	type=semver,pattern={{version}}
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3
	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3
	- name: Login to GHCR
	if: startsWith(github.ref, 'refs/tags/')
	uses: docker/login-action@v3
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ github.token }}
	- name: Build and push image
	uses: docker/build-push-action@v6
	with:
	push: ${{ startsWith(github.ref, 'refs/tags/') }}
	platforms: linux/amd64,linux/arm64
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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