[goreleaser] add `packages: write` permissions #35

	name: Docker

	on:
	push:
	tags:
	- '*'
	pull_request:

	jobs:
	docker:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout
	uses: actions/checkout@v2

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v1

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1
	with:
	version: latest
	buildkitd-flags: --debug

	- name: Cache Docker layers
	uses: actions/cache@v2
	with:
	path: /tmp/.buildx/cache
	key: ${{ runner.os }}-buildx-${{ github.sha }}
	restore-keys: \|
	${{ runner.os }}-buildx-

	- name: Login to DockerHub
	uses: docker/login-action@v1
	# The secrets are not available in pull_requests. This step is only
	# needed to push, so it's fine to skip this in PR builds.
	if: ${{ github.event_name != 'pull_request' }}
	with:
	username: ${{ secrets.DOCKER_USERNAME }}
	password: ${{ secrets.DOCKER_PASSWORD }}

	- name: Output version
	id: version
	run: \|
	echo ::set-output name=version::${GITHUB_REF##*/}

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	# Only push if there was a tag pushed
	push: ${{ github.event_name != 'pull_request' }}
	cache-from: type=local,src=/tmp/.buildx/cache
	cache-to: type=local,dest=/tmp/.buildx/cache,mode=max
	tags: \|
	${{ github.repository }}:latest
	${{ github.repository }}:${{ steps.version.outputs.version }}

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