fix(4.8): update to 4b69a762170d377f7837e9ca555b3bbbd764e4ba #154

	name: Build and Publish Docker

	on:
	push:
	branches:
	- support-4.8
	- support-4.4
	- support-4.3

	jobs:
	build_and_push:
	runs-on: ubuntu-latest
	env:
	IMAGE_NAME: midpoint-builder
	steps:
	- name: checkout
	uses: actions/checkout@v2

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

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

	- name: Prepare Image Tag
	id: prep
	run: \|
	BASE_IMAGE_TAG=`grep "ARG BASE_IMAGE_TAG" Dockerfile \| cut -d "=" -f 2 \| sed "s/^v//" \| head -n 1`
	RELEASE_REVISION=`grep "ARG RELEASE_REVISION" Dockerfile \| cut -d "=" -f 2`
	IMAGE_TAG=${BASE_IMAGE_TAG}-${RELEASE_REVISION}
	FULL_IMAGE_NAME=ghcr.io/${{ github.repository_owner }}/${IMAGE_NAME}

	echo "Building $FULL_IMAGE_NAME:$IMAGE_TAG"

	echo ::set-output name=name::${FULL_IMAGE_NAME}
	echo ::set-output name=tag::${IMAGE_TAG}

	- name: Build and push
	uses: docker/build-push-action@v2
	with:
	push: true
	tags: ${{ steps.prep.outputs.name }}:${{ steps.prep.outputs.tag }}
	cache-from: type=registry,ref=${{ steps.prep.outputs.name }}:support-4.8
	cache-to: type=registry,ref=${{ steps.prep.outputs.name }}:support-4.8,mode=max

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