[NFC][CI] Use Fully Qualified Names for All Containers

Fix the rest of the containers sitting around in the monorepo.

Author: boomanaiden154

clang/utils/analyzer/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:bionic
+FROM docker.io/ubuntu:bionic
 
 RUN apt-get update && apt-get install -y \
     apt-transport-https \

libc/utils/buildbot/Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:10
+FROM docker.io/debian:10
 
 # Installing dependencies.
 RUN dpkg --add-architecture i386

llvm/utils/docker/example/Dockerfile

@@ -10,7 +10,7 @@
 
 # Stage 1. Check out LLVM source code and run the build.
 # FIXME: Replace 'ubuntu' with your base image
-FROM ubuntu AS builder
+FROM docker.io/ubuntu AS builder
 # FIXME: Change maintainer name
 LABEL maintainer="Maintainer <maintainer@email>"
 # FIXME: Install llvm/clang build dependencies here. Including compiler to
@@ -29,7 +29,7 @@ RUN /tmp/scripts/build_install_llvm.sh --to /tmp/clang-install ${buildscript_arg
 
 # Stage 2. Produce a minimal release image with build results.
 # FIXME: Replace 'ubuntu' with your base image.
-FROM ubuntu
+FROM docker.io/ubuntu
 # FIXME: Change maintainer name.
 LABEL maintainer="Maintainer <maintainer@email>"
 # FIXME: Install all packages you want to have in your release container.

llvm/utils/docker/nvidia-cuda/Dockerfile

@@ -6,7 +6,7 @@
 #
 #===----------------------------------------------------------------------===//
 # Stage 1. Check out LLVM source code and run the build.
-FROM nvidia/cuda:12.6.3-devel-ubuntu24.04 AS builder
+FROM docker.io/nvidia/cuda:12.6.3-devel-ubuntu24.04 AS builder
 LABEL maintainer="LLVM Developers"
 # Install llvm build dependencies.
 RUN apt-get update && \
@@ -26,7 +26,7 @@ RUN /tmp/scripts/build_install_llvm.sh --to /tmp/clang-install ${buildscript_arg
 
 
 # Stage 2. Produce a minimal release image with build results.
-FROM nvidia/cuda:12.6.3-devel-ubuntu24.04
+FROM docker.io/nvidia/cuda:12.6.3-devel-ubuntu24.04
 LABEL maintainer="LLVM Developers"
 # Copy clang installation into this container.
 COPY --from=builder /tmp/clang-install/ /usr/local/

polly/lib/External/isl/imath/tests/linux/Dockerfile

@@ -4,7 +4,7 @@
 #
 #   docker run --rm -it "$(docker build -f tests/linux/Dockerfile -q .)"
 #
-FROM alpine:latest AS base
+FROM docker.io/alpine:latest AS base
 
 RUN apk add --no-cache bash build-base gcc gmp-dev make python2