[llvm] Add AArch64 support to the premerge tests (PR #155274)

[Tom Stellard via llvm-commits]

https://github.com/tstellar created https://github.com/llvm/llvm-project/pull/155274

None

>From 57697a66cfdddf2028c7260f1ce61ecacc550d00 Mon Sep 17 00:00:00 2001
From: Tom Stellard <tstellar at redhat.com>
Date: Mon, 25 Aug 2025 17:15:36 +0000
Subject: [PATCH] Add AArch64 support to the premerge tests

---
 .github/workflows/premerge.yaml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/premerge.yaml b/.github/workflows/premerge.yaml
index 9d925517a7211..6d83573702a79 100644
--- a/.github/workflows/premerge.yaml
+++ b/.github/workflows/premerge.yaml
@@ -28,7 +28,13 @@ jobs:
     if: >-
         github.repository_owner == 'llvm' &&
         (github.event_name != 'pull_request' || github.event.action != 'closed')
-    runs-on: llvm-premerge-linux-runners
+    matrix:
+      runs-on:
+        - llvm-premerge-linux-runners
+        - depot-ubuntu-24.04-arm-64
+    runs-on: ${{ matrix.runs-on }}
+    container:
+      image: ${{ (startsWith(matrix.runs-on, 'depot-ubuntu-24.04-arm') && "ghcr.io/$GITHUB_REPOSITORY_OWNER/arm64v8/ci-ubuntu-24.04-agent" ) || null }}
     steps:
       - name: Checkout LLVM
         uses: actions/checkout at 08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0