Fix JRuby CI runs #139

	name: Deploy docker
	on:
	push:
	branches:
	- master
	paths-ignore:
	- '**.md'
	- '**.txt'
	- 'contrib/**'
	release:
	types: [published]
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Set deploy name to master
	if: github.ref == 'refs/heads/master'
	run: \|
	echo "DEPLOY_NAME=gollumwiki/gollum:master" >> $GITHUB_ENV
	- name: Set deploy name to release version
	if: startsWith(github.ref, 'refs/tags/')
	run: \|
	echo "DEPLOY_NAME=gollumwiki/gollum:${{ github.ref_name }}" >> $GITHUB_ENV
	- name: Check Out Repo
	uses: actions/checkout@v2
	- name: Login
	uses: docker/login-action@v1
	with:
	username: ${{ secrets.DOCKER_HUB_USERNAME }}
	password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
	- name: Set up Docker Buildx
	id: buildx
	uses: docker/setup-buildx-action@v1
	- 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: Build and push
	id: docker_build
	uses: docker/build-push-action@v2
	with:
	context: ./
	file: ./Dockerfile
	builder: ${{ steps.buildx.outputs.name }}
	push: true
	tags: ${{ env.DEPLOY_NAME }}
	cache-from: type=local,src=/tmp/.buildx-cache
	cache-to: type=local,dest=/tmp/.buildx-cache
	platforms: linux/amd64, linux/arm64
	- name: Image digest
	run: echo ${{ steps.docker_build.outputs.digest }}

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