Add location in DB for saving files to bind mount in

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

Closes: #462
Approved by: baude
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f