vegarhenriksen You are unable to for just one container but you can share access to a user account. For this in the top right menu click user switcher and then at the bottom enter the username of the user you want access given to. If you want to keep separate from your own user you can create a new account for that project and use the container transfer system to move the container to that user. (you can also transfer credit to that account in settings).
Then just give your main user and the user you want access to that container shared access to the entire user.