v1.4.0-rc2

What's Changed

• fix winner count by @diwufeiwen in #59
• Init: add slash-filter & mysql-conn flag by @diwufeiwen in #60
• Mining: Only manual control switch by @diwufeiwen in #62
• fix slash filter for mysql by @diwufeiwen in #63
• add tag-workflow.yml by @diwufeiwen in #64
• fix: workflow step 'build' returns error by @zl03jsj in #66

Full Changelog: v1.2.0...v1.4.0-rc2