Fixing up Dockerfile, adding github action to build image #4


	name: Build Docker image
	# Shamelessly cribbed from https://docs.docker.com/build/ci/github-actions/test-before-push/
	# with minor modifications
	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	env:
	TEST_TAG: user/app:test
	LATEST_TAG: user/app:latest

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	- name: Fixup checkout
	uses: actions/checkout@v4
	with:
	fetch-tags: true

	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

	- name: Set up Docker Buildx
	uses: docker/setup-buildx-action@v3

	- name: Build and export to Docker
	uses: docker/build-push-action@v6
	with:
	load: true
	tags: ${{ env.TEST_TAG }}

	- name: Test
	run: \|
	docker run --rm ${{ env.TEST_TAG }} -c "fit_dataset --help"

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