Remove standard values for environment vars in docker file

[helto4real]

Breaking change

Proposed change

Fixes the problem of double or randon values if users add vars with different case

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to an existing integration)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the [development checklist][dev-checklist]
• The code compiles without warnings (code quality chek)
• Tests have been added to verify that the new code works.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

[codecov-commenter]

Codecov Report

Merging #643 (c5bb6d6) into dev (9939ef4) will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##              dev     #643      +/-   ##
==========================================
- Coverage   80.49%   80.39%   -0.10%     
==========================================
  Files         117      117              
  Lines        3004     3004              
  Branches      321      321              
==========================================
- Hits         2418     2415       -3     
- Misses        452      455       +3     
  Partials      134      134              

Flag	Coverage Δ
unittests	80.39% <ø> (-0.10%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...mon.HassClient/Internal/Net/WebSocketClientImpl.cs	61.11% <0.00%> (-8.34%)	⬇️

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