chore: rename user instead of delete and create

Author: rjaegers

.devcontainer/cpp/Dockerfile

@@ -102,7 +102,7 @@ RUN --mount=type=cache,target=/cache,sharing=locked \
  && apt-get clean
 
 # Update all tool alternatives to the correct version
-# and patch root's bashrc to include bash-completion
+# and rename the default 'ubuntu' user to 'code'
 RUN --mount=type=cache,target=/var/log,sharing=locked \
  update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-14 10 \
                         --slave /usr/bin/g++ g++ /usr/bin/g++-14 \
@@ -114,34 +114,15 @@ RUN --mount=type=cache,target=/var/log,sharing=locked \
                         --slave /usr/bin/mull-reporter mull-reporter /usr/bin/mull-reporter-${CLANG_VERSION} \
                         --slave /usr/lib/mull-ir-frontend mull-ir-frontend /usr/lib/mull-ir-frontend-${CLANG_VERSION} \
  && update-alternatives --install /usr/bin/python python /usr/bin/python3 10 \
- && cp /etc/skel/.bashrc /root/.bashrc
+ && usermod -m -d /home/code -l code ubuntu \
+ && groupmod -n code ubuntu
 
-# Create the 'code' user
-# First remove the existing ubuntu user and group that use UID/GID 1000
-RUN userdel -r ubuntu 2>/dev/null || true \
- && groupdel ubuntu 2>/dev/null || true \
- && groupadd --gid 1000 code \
- && useradd --uid 1000 --gid code --shell /bin/bash --create-home code \
- && cp /etc/skel/.bashrc /home/code/.bashrc \
- && chown -R code:code /home/code
+USER code
 
 # Set up package managers CPM and Conan
 # - Install CPM.cmake to the CMake module path
 # - Configure a default profile for Conan and set the CMake generator to Ninja
 RUN --mount=type=cache,target=/cache,sharing=locked \
- wget --no-hsts -qP /usr/local/lib/python*/dist-packages/cmake/data/share/cmake-*/Modules/ https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_VERSION}/CPM.cmake \
+ wget --no-hsts -qP /usr/local/lib/python*/dist-packages/cmake/data/share/cmake-*/Modules/ https://github.com/cpm-cmake/CPM.cmake/releases/download/v${CPM_VERSION}/CPM.cmake
  && conan profile detect \
  && echo -e "\n[conf]\ntools.cmake.cmaketoolchain:generator=Ninja" >> "$(conan profile path default)"
-
-# Create cache directories and conan directory with appropriate permissions for the code user
-RUN mkdir -p /cache/.ccache /cache/.cpm /cache/.python /opt/conan \
- && chown -R code:code /cache /opt/conan \
- && chmod -R 755 /cache /opt/conan
-
-# Set up conan for the code user
-USER code
-RUN conan profile detect \
- && echo -e "\n[conf]\ntools.cmake.cmaketoolchain:generator=Ninja" >> "$(conan profile path default)"
-
-# Set the default user
-USER code