compatibility upgrades with newer mud + new example #4

	name: docker

	on:
	release:
	types: [published, created, edited]
	push:
	branches: ["docker"]

	jobs:
	build_image:
	name: Build Docker image from source
	runs-on: ubuntu-latest
	steps:
	- name: Check out the repo
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

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

	- name: Push to Docker Hub
	uses: docker/build-push-action@v2
	with:
	context: .
	file: ./bin/Dockerfile
	push: false
	tags: mathematicalmichael/mudex:latest,mudex
	build-args: \|
	USER_ID=1000
	GROUP_ID=1000

	- name: Test functionality
	run: \|
	make help
	make test

	- name: Image digest
	run: echo ${{ steps.push_to_dockerhub.outputs.digest }}

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