[llvm] [Github][Docker] Remove 'docker.io/library' from image name (PR #162007)

[Baranov Victor via llvm-commits]

https://github.com/vbvictor created https://github.com/llvm/llvm-project/pull/162007

Based on https://github.com/llvm/llvm-project/pull/161083#discussion_r2404139880, we don't specify explicitly `docker.io/library/`, this is the only violation I could find.

>From 4edcca5de9205b8fb91033b120fa847a667afa93 Mon Sep 17 00:00:00 2001
From: Victor Baranov <bar.victor.2002 at gmail.com>
Date: Sun, 5 Oct 2025 14:24:25 +0300
Subject: [PATCH] [Github][Docker] Remove 'docker.io/library' from image name

---
 .github/workflows/containers/github-action-ci/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/containers/github-action-ci/Dockerfile b/.github/workflows/containers/github-action-ci/Dockerfile
index dc0c9cabc7f01..c9aa0bbd31d81 100644
--- a/.github/workflows/containers/github-action-ci/Dockerfile
+++ b/.github/workflows/containers/github-action-ci/Dockerfile
@@ -1,4 +1,4 @@
-FROM docker.io/library/ubuntu:24.04 AS base
+FROM ubuntu:24.04 AS base
 ENV LLVM_SYSROOT=/opt/llvm
 
 FROM base AS stage1-toolchain