Added docker host detection and support for setting container host explicitly with env variable - #85

Codecov Report

Attention: Patch coverage is 34.78261% with 30 lines in your changes missing coverage. Please review.

Project coverage is 79.95%. Comparing base (1e4fa30) to head (6979ad1).
Report is 547 commits behind head on master.

@@            Coverage Diff             @@
##           master      #85      +/-   ##
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- Coverage   84.94%   79.95%   -5.00%     
==========================================
  Files          19       19              
  Lines         392      434      +42     
  Branches       25       34       +9     
==========================================
+ Hits          333      347      +14     
- Misses         43       68      +25     
- Partials       16       19       +3     

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Hey, I've merged your branch into the gitlab2 branch (because we can't test on pull requests from forks on gitlab ci). Unfortunately, the tests seem to fail. See here for the logs.

Do you know why that might be happening? Quite possibly a result of the config not being right.

I have looked into failed test cases. They are required fix in this PR. I think they are used to fail in the docker:dind before. I will push some more commits to fix these when I have some time in the next week.

https://github.com/tuvshuud/testcontainers-python/blob/c058fd0d02ded23d21a9befb61dc4651155bfcb2/tests/test_docker_compose.py#L32

https://github.com/tuvshuud/testcontainers-python/blob/c058fd0d02ded23d21a9befb61dc4651155bfcb2/tests/test_new_docker_api.py#L35

@tillahoffmann I have fixed the test cases and improved host detection function. Also, I ran all the test cases on Gitlab CI/CD and all passed. Can you merge into gitlab2 and check it now?