create docker file for gh actions runner #25

	name: Build & publish multiple docker images
	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: ${{ github.repository }}

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	include:
	- dockerfile: ./github-actions-runner/Dockerfile
	image: gh-actions-runner

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

	- name: Login to GitHub Container Registry
	uses: docker/login-action@v1
	with:
	registry: ghcr.io
	username: ${{ github.repository_owner }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Build and push Docker image
	uses: docker/build-push-action@v2
	with:
	file: ${{ matrix.dockerfile }}
	context: .
	image: ${{ matrix.image }}
	tags: ghcr.io/joren-vangoethem/${{ matrix.image }}:latest
	push: true

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