🐳 Work about Docker. add mysql dockerfile

doc/db/1schema.sql

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+-- pigx 核心表
+create database `pigxx` default character set utf8mb4 collate utf8mb4_general_ci;
+
+-- pigx 工作流相关库
+create database `pigxx_acl` default character set utf8mb4 collate utf8mb4_general_ci;