Would add optional `tag_name`?

[zhengmz]

current, this plugin:

drone-gitea-release/plugin.go

Line 57 in 6ae63e4

return fmt.Errorf("The Gitea Release plugin is only available for tags")

I hope can add tag_name:

• when set
  • exist: use it
  • non-existent; create it ref to $DRONE_COMMIT
• when not set, must run in event 'tag'