Commits on May 8, 2021

1. Dockerfile_alpine: fix broken pip six installation …

   Fixes docker hub error:
   
   ```
   Step 32/49 : RUN pip3 install --upgrade pip six grass-session
   ---> Running in 1c63e0d56789
   Collecting pip
   Downloading pip-21.1.1-py3-none-any.whl (1.5 MB)
   Collecting six
   Downloading six-1.16.0-py2.py3-none-any.whl (11 kB)
   Collecting grass-session
   Downloading grass_session-0.5-py2.py3-none-any.whl (31 kB)
   Installing collected packages: pip, six, grass-session
   Attempting uninstall: pip
   Found existing installation: pip 20.0.2
   Uninstalling pip-20.0.2:
   Successfully uninstalled pip-20.0.2
   Attempting uninstall: six
   Found existing installation: six 1.15.0
   ERROR: Cannot uninstall 'six'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
   ```

   

   neteler committed May 8, 2021
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