Fix Dockerfile, closes #112 #75

	---
	name: ci

	on:
	pull_request:
	push:
	branches:
	- master

	env:
	CONTAINER_NAME: panamax-rs/panamax

	jobs:
	test:
	runs-on: ubuntu-latest

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

	- name: Test building image
	run: docker build -t ${{ env.CONTAINER_NAME }}:test .

	- name: Run the built image
	run: docker run --rm ${{ env.CONTAINER_NAME }}:test

	release:
	name: Release
	runs-on: ubuntu-latest
	needs: test
	if: github.ref == 'refs/heads/master'

	steps:
	- uses: actions/checkout@v2
	- uses: docker/setup-qemu-action@v1
	- uses: docker/setup-buildx-action@v1

	- name: Login to DockerHub
	uses: docker/login-action@v2
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Build and export to Docker
	uses: docker/build-push-action@v3
	with:
	context: .
	load: true
	tags: ${{ env.TEST_TAG }}

	- name: Build and push
	uses: docker/build-push-action@v3
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: false
	tags: ${{ env.CONTAINER_NAME }}:latest
	...

Provide feedback