[llvm] [Bolt] Use fully qualified docker image name (NFC) (PR #162154)

[Baranov Victor via llvm-commits]

https://github.com/vbvictor created https://github.com/llvm/llvm-project/pull/162154

Based on https://github.com/llvm/llvm-project/pull/162007#issuecomment-3373161948, we should avoid having short links in docker images.

>From 51faca91a4092d4f4d8e5cc0a371ef599a91979a Mon Sep 17 00:00:00 2001
From: Victor Baranov <bar.victor.2002 at gmail.com>
Date: Mon, 6 Oct 2025 23:27:58 +0300
Subject: [PATCH] [Bolt] Use fully qualified names in docker image

---
 bolt/utils/docker/Dockerfile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/bolt/utils/docker/Dockerfile b/bolt/utils/docker/Dockerfile
index c58e1a533df94..86d1be2141655 100644
--- a/bolt/utils/docker/Dockerfile
+++ b/bolt/utils/docker/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu:24.04 AS builder
+FROM docker.io/library/ubuntu:24.04 AS builder
 
 ARG DEBIAN_FRONTEND=noninteractive
 ENV TZ=UTC
@@ -25,6 +25,6 @@ RUN mkdir build && \
     ninja check-bolt && \
     ninja install-llvm-bolt install-merge-fdata install-bolt_rt
 
-FROM ubuntu:24.04
+FROM docker.io/library/ubuntu:24.04
 
 COPY --from=builder /home/bolt/install /usr/local