docs: add note about using original uncompressed images in export/import #15

	# Simple workflow for deploying to Docker Hub
	name: Publish Docker image to Docker Hub

	on:
	push:
	tags:
	- "v.." # Push events to matching v, i.e. v1.0, v20.15.10

	jobs:
	build-and-push:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	with:
	fetch-depth: 0

	- name: Docker meta
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ secrets.DOCKERHUB_USERNAME }}/roadbook

	- name: Login to Docker Hub
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	- name: Build and push
	uses: docker/build-push-action@v5
	with:
	context: .
	file: ./Dockerfile
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}

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