[build-docker] Bringing linux/arm/v7 Docker Target back #5

	name: Build and push Docker image

	on:
	push:
	branches:
	- 'master'
	workflow_dispatch:

	jobs:
	docker:
	name: Build and Push Docker image to Docker Hub
	# Only run if the commit message contains the string [build-docker]
	if: contains(github.event.head_commit.message, '[build-docker]')
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2

	# Read the version
	- name: Read version
	run: echo "VERSION=$(cat OpenBullet2.Web/version.txt)" >> $GITHUB_ENV

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

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v1

	- name: Login to DockerHub
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	push: true
	platforms: linux/arm64/v8,linux/amd64
	tags: openbullet/openbullet2:latest,openbullet/openbullet2:${{ env.VERSION }}

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