Fix locale issue if LC_ALL is unset

[lreiher]

Problem

• Ubuntu 22
• echo $LC_ALL prints nothing
• docker-run gitlab.ika.rwth-aachen.de:5050/fb-fi/its-modules/monitoring/ros-monitoring cannot start RViz

  dockeruser@8fa8e9f1e306:/docker-ros/ws$ rviz2
  QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-dockeruser'
  [INFO] [1718691638.738652173] [rviz2]: Stereo is NOT SUPPORTED
  [INFO] [1718691638.738745810] [rviz2]: OpenGl version: 4.5 (GLSL 4.5)
  terminate called after throwing an instance of 'std::runtime_error'
    what():  locale::facet::_S_create_c_locale name not valid
  Aborted (core dumped)
  

Reason

• --env LC_ALL is added as part of docker-run
• export LC_ALL=C fixes the problem inside the container