[llvm] [Github] Add pr-subscribes-infrastructure notifications (PR #142697)

[Aiden Grossman via llvm-commits]

https://github.com/boomanaiden154 created https://github.com/llvm/llvm-project/pull/142697

This patch sets up the new PRs labeller for a
pr-subscribers-infrastructure team that can be used for recieving notifications about infrastructure changes in the monorepo. This is primarily centered around the .ci directory currently where most of the action is taking place.

>From 1528262c48a20d549f292f385b82f43432cb34d5 Mon Sep 17 00:00:00 2001
From: Aiden Grossman <aidengrossman at google.com>
Date: Tue, 3 Jun 2025 23:43:58 +0000
Subject: [PATCH] [Github] Add pr-subscribes-infrastructure notifications

This patch sets up the new PRs labeller for a
pr-subscribers-infrastructure team that can be used for recieving
notifications about infrastructure changes in the monorepo. This is
primarily centered around the .ci directory currently where most of the
action is taking place.
---
 .github/new-prs-labeler.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.github/new-prs-labeler.yml b/.github/new-prs-labeler.yml
index 162161ff13fb0..9a31afe96b08a 100644
--- a/.github/new-prs-labeler.yml
+++ b/.github/new-prs-labeler.yml
@@ -1095,3 +1095,6 @@ tablegen:
   - llvm/include/TableGen/**
   - llvm/lib/TableGen/**
   - llvm/utils/TableGen/**
+
+infrastructure:
+  - .ci/**