I have a large database file stored in a Git repository. This file is updated and saved to the repository regularly. I do not want Git to keep track of the changes to this file now, though I do want the file to be stored in the repository and to be up-to-date. Instead of keeping track of the changes to the database using Git (resulting in the size of the repository increasing considerably), it is preferable to save an occasional "release" copy of the database.
How should this be done? Note that this question is not asking simply how to stop tracking a file; the file in the repository must be kept up-to-date.