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release: v1.0.4 - official PyPI + Docker Hub distribution #1

	name: Publish Docker image

	# Builds the all-in-one image and pushes it to Docker Hub on every version tag.
	# One-time setup (GitHub repo → Settings → Secrets and variables → Actions):
	# - Variable DOCKERHUB_USERNAME = your Docker Hub username (e.g. davidesidoti)
	# - Secret DOCKERHUB_TOKEN = a Docker Hub access token (Account → Security)
	# Image is published as <DOCKERHUB_USERNAME>/unit3dprep with tags X.Y.Z, X.Y, latest.

	on:
	push:
	tags:
	- "v*"
	workflow_dispatch:

	permissions:
	contents: read

	jobs:
	docker:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Docker metadata (tags + labels)
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ vars.DOCKERHUB_USERNAME }}/unit3dprep
	tags: \|
	type=semver,pattern={{version}}
	type=semver,pattern={{major}}.{{minor}}
	type=raw,value=latest

	- uses: docker/setup-qemu-action@v3
	- uses: docker/setup-buildx-action@v3

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

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: .
	# amd64 only for now. To also build arm64, change to:
	# platforms: linux/amd64,linux/arm64
	# (slower — arm64 builds under QEMU emulation).
	platforms: linux/amd64
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max