Add intelanalytics/ipex-llm:sources image for OSPDT (#11296)

* Add intelanalytics/ipex-llm:sources image

* apt-get source

docker/llm/sources/Dockerfile

@@ -0,0 +1,17 @@
+FROM ubuntu:22.04
+
+# Add deb-src entries to the sources.list
+RUN echo "deb-src http://archive.ubuntu.com/ubuntu/ focal main restricted universe multiverse" >> /etc/apt/sources.list
+
+# Update package lists and install dpkg-dev
+RUN apt-get update && apt-get install -y dpkg-dev
+
+# Create a temporary directory, adjust permissions, and download source code for the specified packages
+RUN mkdir -p /usr/local/src/git-source && \
+    chown _apt:root /usr/local/src/git-source && \
+    cd /usr/local/src/git-source && \
+    apt-get source \
+    git \
+    gnupg \
+    numactl \
+    wget

docker/llm/sources/README.md

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+This is used for OSPDT review.
+
+A separate Docker container layer tagged as: <YOUR_DOCKER_IMAGE>:<xPL_VERSION>-sources tag for sources of 3d party packages with MPL 1.x, MPL 2.x, GPL 1.x, GPL 2.x and GPL 3.x variants.
+
+### Build Image
+```bash
+docker build \
+  --build-arg http_proxy=.. \
+  --build-arg https_proxy=.. \
+  --build-arg no_proxy=.. \
+  --rm --no-cache -t intelanalytics/ipex-llm:sources .
+```