refactor: update Containerfile to support non-root user execution and improve security (#368)

Set default container user/group to lower privilege app user 

* refactor: update Containerfile to support non-root user execution and improve security

- Updated LS_VER argument from 89 to 170 to use the latest version
- Added UID/GID arguments with default values of 0 (root) for backward compatibility
- Added USER_HOME environment variable set to /root
- Implemented conditional user/group creation logic that only runs when UID/GID are not 0
- Created necessary directory structure with proper ownership using mkdir and chown commands
- Switched to non-root user execution for improved security posture
- Updated COPY instruction to use --chown flag for proper file ownership

* chore: update containerfile to use non-root user with proper UID/GID

- Changed default UID and GID from 0 (root) to 10001 for security best practices
- Updated USER_HOME from /root to /app to avoid running as root user

docker/llama-swap.Containerfile

@@ -2,7 +2,29 @@ ARG BASE_TAG=server-cuda
 FROM ghcr.io/ggml-org/llama.cpp:${BASE_TAG}
 
 # has to be after the FROM
-ARG LS_VER=89
+ARG LS_VER=170
+
+# Set default UID/GID arguments
+ARG UID=10001
+ARG GID=10001
+ARG USER_HOME=/app
+
+# Add user/group
+ENV HOME=$USER_HOME
+RUN if [ $UID -ne 0 ]; then \
+      if [ $GID -ne 0 ]; then \
+        addgroup --system --gid $GID app; \
+      fi; \
+      adduser --system --no-create-home --uid $UID --gid $GID \
+      --home $USER_HOME app; \
+    fi
+
+# Handle paths
+RUN mkdir --parents $HOME /app
+RUN chown --recursive $UID:$GID $HOME /app
+
+# Switch user
+USER $UID:$GID
 
 WORKDIR /app
 RUN \
@@ -10,7 +32,7 @@ RUN \
     tar -zxf llama-swap_"${LS_VER}"_linux_amd64.tar.gz && \
     rm llama-swap_"${LS_VER}"_linux_amd64.tar.gz
 
-COPY config.example.yaml /app/config.yaml
+COPY --chown=$UID:$GID config.example.yaml /app/config.yaml
 
 HEALTHCHECK CMD curl -f http://localhost:8080/ || exit 1
 ENTRYPOINT [ "/app/llama-swap", "-config", "/app/config.yaml" ]