Add github workflow to build docker image and push to registry #1

	name: Builde docker image

	on:
	push:
	branches: ['**']
	pull_request:
	branches: ['**']

	env:
	REGISTRY: ghcr.io

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	submodules: true

	- run: echo "IMAGE_TAG=${GITHUB_REF_NAME//\//-}" >> $GITHUB_ENV

	- name: Build docker image
	run: docker build -t p2pu/lernanta:${IMAGE_TAG} .

	- name: log into registry
	uses: docker/login-action@v2
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: push docker image
	run: \|
	docker tag p2pu/lernanta:${IMAGE_TAG} ghcr.io/p2pu/lernanta:${IMAGE_TAG}
	docker push ghcr.io/p2pu/lernanta:${IMAGE_TAG}

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