更新 Dockerfile 和 GitHub Actions 工作流，支持多平台构建。添加 QEMU 设置以支持不同架构，修改 Docke… #54

	name: Build and Push Docker Image

	on:
	push:
	branches:
	- main
	pull_request:
	workflow_dispatch:

	env:
	REGISTRY: ghcr.io
	IMAGE_NAME: excalidraw-full
	OWNER: betterandbetterii

	jobs:
	build-and-push:
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write

	steps:
	- name: Checkout repository
	uses: actions/checkout@v4
	with:
	submodules: true

	- name: Log in to Container Registry
	uses: docker/login-action@v3
	with:
	registry: ${{ env.REGISTRY }}
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}

	- name: Extract metadata
	id: meta
	uses: docker/metadata-action@v5
	with:
	images: ${{ env.REGISTRY }}/${{ env.OWNER }}/${{ env.IMAGE_NAME }}
	tags: \|
	type=ref,event=branch
	type=ref,event=pr
	type=semver,pattern={{version}}
	type=semver,pattern={{major}}.{{minor}}
	type=raw,value=latest,enable={{is_default_branch}}

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

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

	- name: Build and push Docker image
	uses: docker/build-push-action@v5
	with:
	context: .
	file: ./excalidraw-complete.Dockerfile
	push: true
	platforms: linux/amd64,linux/arm64
	tags: ${{ steps.meta.outputs.tags }}
	cache-from: type=registry,ref=${{ env.REGISTRY }}/${{ env.OWNER }}/${{ env.IMAGE_NAME }}:buildcache
	cache-to: type=registry,ref=${{ env.REGISTRY }}/${{ env.OWNER }}/${{ env.IMAGE_NAME }}:buildcache,mode=max

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