Dockerfile fails to build when UID/GID matches with the existing docker image user

[arntanguy]

My host user has uid 1000 and gid 100. A user ubuntu with the same id already existing within the osrf/ros:jazzy-desktop image, causing this command to fail

RUN groupadd --gid $USER_GID $USERNAME \
    && useradd --uid $USER_UID --gid $USER_GID -m $USERNAME \
    && mkdir -p -m 0700 /run/user/"${USER_UID}" \
    && mkdir -p -m 0700 /run/user/"${USER_UID}"/gdm \
    && chown user:user /run/user/"${USER_UID}" \
    && chown user:user /workspaces \
    && chown user:user /run/user/"${USER_UID}"/gdm

The following works for me, but is not a clean fix:

ARG USERNAME=ubuntu
RUN mkdir -p -m 0700 /run/user/"${USER_UID}" \
    && mkdir -p -m 0700 /run/user/"${USER_UID}"/gdm \
    && chown user:user /run/user/"${USER_UID}" \
    && chown user:user /workspaces \
    && chown user:user /run/user/"${USER_UID}"/gdm

Would you consider publishing a repo with urdf files pre-generated (by CI)? This is quite uncommon to have a description package that does not provide ready-to-use urdf files, and even more uncommon to rely on docker to generate them.