docs: add Railway template required sections #20

	name: Docker

	on:
	push:
	branches: [main]
	tags: ['v..*']
	pull_request:
	branches: [main]

	env:
	IMAGE: flowenginecloud/flowengine

	jobs:
	build-and-push:
	# Only publish from the public repo — never from the private demo/staging repo.
	if: github.repository == 'FlowEngine-cloud/flowengine'
	runs-on: ubuntu-latest
	permissions:
	contents: read

	steps:
	- name: Checkout
	uses: actions/checkout@v4

	# Required for linux/arm64 builds (Raspberry Pi, Apple Silicon servers)
	- name: Set up QEMU
	uses: docker/setup-qemu-action@v3

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

	- name: Log in to Docker Hub
	if: github.event_name != 'pull_request'
	uses: docker/login-action@v3
	with:
	username: ${{ secrets.DOCKERHUB_USERNAME }}
	password: ${{ secrets.DOCKERHUB_TOKEN }}

	# Extracts tags automatically:
	# push to main → :latest
	# push tag v1.2.3 → :1.2.3, :1.2, :latest
	# pull_request → :pr-42 (build-only, no push)
	- name: Extract metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.IMAGE }}
	tags: \|
	type=ref,event=pr
	type=semver,pattern={{version}}
	type=semver,pattern={{major}}.{{minor}}
	type=raw,value=latest,enable={{is_default_branch}}

	- name: Build and push
	uses: docker/build-push-action@v6
	with:
	context: .
	platforms: linux/amd64,linux/arm64
	push: ${{ github.event_name != 'pull_request' }}
	tags: ${{ steps.meta.outputs.tags }}
	labels: ${{ steps.meta.outputs.labels }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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