chore(Dockerfile): Use Alpine image for smaller size #761
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使用
lts-alpine
能够减小构建出的image体积(本地测试从325MB缩小为了264MB,约60MB)。经过简单的测试,评论、邮件通知、实时通知、导入导出功能均正常。同时修复了构建镜像时的警告
"ENV key=value" should be used instead of legacy "ENV key value" format
。