Add new gitlab project bot for the aurweb-tfstate project

The last gitlab bot[1] for the aurweb-tfstate project expired[2] some
time ago, but it was not replaced with a new project bot.

A new project bot has just been added, because we need the use-case[3]
working again.

[1] 7a994067 ("gluebuddy: Add new gitlab bot for the aurweb-tfstate project")
[2] 242213b2 ("gluebuddy: Remove deleted project bot for arch-boxes")
[3] 5fb8df85 ("gluebuddy: Add gitlab bot for aurweb-tfstate project")