Small fixes

[goldarte]

Add small fixes for running workbench:

• Auto detect user id in dockerfile
• Add check if rclpy was already inited
• chmod +x for run.bash

In my case, I have user id 1001, so can't do anything with created files from container. Also I get an error at Freecad startup in Report View:

18:38:21  During initialization the error "Context.init() must only be called once" occurred in freecad.cross
18:38:21  --------------------------------------------------------------------------------
18:38:21  Traceback (most recent call last):
  File "<string>", line 226, in InitApplications
  File "/usr/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/home/goldarte/.local/share/FreeCAD/Mod/freecad.robotcad/freecad/cross/__init__.py", line 9, in <module>
    from .wb_globals import g_ros_distro
  File "/usr/lib/python3/dist-packages/shiboken2/files.dir/shibokensupport/__feature__.py", line 142, in _import
    return original_import(name, *args, **kwargs)
  File "/home/goldarte/.local/share/FreeCAD/Mod/freecad.robotcad/freecad/cross/wb_globals.py", line 24, in <module>
    g_ros_node, g_ros_executor = get_node_and_executor()
  File "/home/goldarte/.local/share/FreeCAD/Mod/freecad.robotcad/freecad/cross/ros/node.py", line 30, in get_node_and_executor
    rclpy.init()
  File "/opt/ros/iron/lib/python3.10/site-packages/rclpy/__init__.py", line 89, in init
    return context.init(args, domain_id=domain_id)
  File "/opt/ros/iron/lib/python3.10/site-packages/rclpy/context.py", line 70, in init
    raise RuntimeError('Context.init() must only be called once')
RuntimeError: Context.init() must only be called once

[drfenixion]

Thank you for contribution. I will process PRs after big feature pack i am working on.

[drfenixion]

Thank you. Merged.