Avoid ROS setup nounset failure during Docker build

Author: ncbdrck

docker/Dockerfile

@@ -85,6 +85,8 @@ WORKDIR /home/${USERNAME}
 # user's HOME so bind mounts on a host with matching UID work cleanly.
 COPY --chown=${USERNAME}:${USERNAME} install_uniros_stack.sh /tmp/install_uniros_stack.sh
 RUN chmod +x /tmp/install_uniros_stack.sh \
+    && sed -i 's|source /opt/ros/noetic/setup.bash|set +u; source /opt/ros/noetic/setup.bash; set -u|' /tmp/install_uniros_stack.sh \
+    && sed -i 's|source "$WORKSPACE_PATH/devel/setup.bash" || true|set +u; source "$WORKSPACE_PATH/devel/setup.bash" || true; set -u|' /tmp/install_uniros_stack.sh \
     && UNIROS_INSTALL_IN_DOCKER=1 \
        /tmp/install_uniros_stack.sh -y -p /home/${USERNAME}/uniros_ws \
     && sudo rm -f /tmp/install_uniros_stack.sh \