1. migrate protected branch fields into one json column
2. use the dropdown list for push/force-push user selection, and Actions
user can be added into the list now.
Migrations should never use model structs directly, because the model
structs can be different in different releases. e.g. if one migration uses
"User" model, it works in the early releases, then one day, when the
User model changes, the migration breaks because it will use the
new (incorrect) User model, it should only use the old User model.
The same to "modules/structs".
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Signed-off-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: delvh <dev.lh@web.de>