ci: add MySQL Docker image build and push workflow #1

	name: 构建 MySQL 镜像

	on:
	workflow_dispatch:
	inputs:
	image_tag:
	description: 镜像标签，留空时使用提交短 SHA
	required: false
	default: ""
	push:
	branches:
	- master
	- main
	paths:
	- docker-mysql/**
	- .github/workflows/mysql-docker.yml

	env:
	IMAGE_NAME: v2nodem-mysql

	jobs:
	docker:
	name: 构建并推送 MySQL 镜像
	runs-on: ubuntu-latest
	permissions:
	contents: read
	packages: write
	env:
	DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
	DOCKERHUB_NAMESPACE: ${{ vars.DOCKERHUB_NAMESPACE }}

	steps:
	- name: 拉取代码
	uses: actions/checkout@v4

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

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

	- name: 生成镜像标签
	id: meta
	shell: bash
	run: \|
	set -euo pipefail
	tag="${{ github.event.inputs.image_tag }}"
	if [ -z "$tag" ]; then
	tag="${GITHUB_SHA::7}"
	fi

	test -n "${DOCKERHUB_USERNAME}" \|\| (echo "DOCKERHUB_USERNAME 未设置" && exit 1)
	namespace="${DOCKERHUB_NAMESPACE:-$DOCKERHUB_USERNAME}"
	image="${namespace}/${IMAGE_NAME}"

	{
	echo "image=${image}"
	echo "tags<<EOF"
	echo "${image}:${tag}"
	echo "${image}:latest"
	echo "EOF"
	} >> "$GITHUB_OUTPUT"

	- name: 构建并推送
	uses: docker/build-push-action@v6
	with:
	context: docker-mysql
	file: docker-mysql/Dockerfile
	push: true
	tags: ${{ steps.meta.outputs.tags }}
	cache-from: type=gha
	cache-to: type=gha,mode=max

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