switch to bootstrap toolchain from 3.0 container (microsoft#14565)

Author: anphel31

toolkit/scripts/toolchain/container/Dockerfile

@@ -3,7 +3,7 @@
 #
 # Dockerfile to build Azure Linux toolchain from scratch
 #
-FROM mcr.microsoft.com/cbl-mariner/base/core:2.0.20240123
+FROM mcr.microsoft.com/azurelinux/base/core:3.0.20250910
 
 # Tag the layers so we can clean up all the containers associated with a build directory
 ARG MARINER_BUILD_DIR
@@ -63,7 +63,7 @@ RUN wget -nv --no-clobber --timeout=30 --continue --input-file=$LFS/tools/toolch
 # Disable downloading from remote sources by default. The 'toolchain-local-wget-list' generated for the above line will download from $(SOURCE_URL)
 # The 'toolchain-remote-wget-list' is still available and can be used as an alternate to $(SOURCE_URL) if desired.
 #RUN wget -nv --no-clobber --timeout=30 --continue --input-file=$LFS/tools/toolchain-remote-wget-list --directory-prefix=$LFS/sources; exit 0
-RUN wget -nv --no-clobber --timeout=30 --continue https://github.com/microsoft/CBL-Mariner-Linux-Kernel/archive/rolling-lts/mariner-3/6.6.104.2.tar.gz -O kernel-6.6.104.2.tar.gz --directory-prefix=$LFS/sources; exit 0
+#RUN wget -nv --no-clobber --timeout=30 --continue https://github.com/microsoft/CBL-Mariner-Linux-Kernel/archive/rolling-lts/mariner-3/6.6.104.2.tar.gz -O kernel-6.6.104.2.tar.gz --directory-prefix=$LFS/sources; exit 0
 USER root
 
 RUN mkdir -pv $LFS/{etc,var} $LFS/usr/{bin,lib,sbin} && \