Volodymyr Lantsov

@tuscen @karb0f0s @MihaZupan let's discuss this feature if we can bring it in `18.0.0` release

Sure, I would try

@HofmeisterAn ubuntu pipeline got stuck?

@HofmeisterAn I don't completely understand the purpose of these classes (`CustomConfiguration`, `EnvironmentConfiguration` and `PropertiesFileConfiguration`) in case of `DockerRegistryAuthenticationProvider` logic, but I made some changes, please review them and let me...

I reviewed and applied your suggestions, but with small change:  `GetDefaultDockerAuthConfig()` now returns nullable value because we want to check for default docker config even if `dockerConfigFile` doesn't exist...

I can test this on my local machine and CI server if you pack it into the NuGet

@HofmeisterAn I confirm that it works locally with `.docker` directory and on CI/CD server with `DOCKER_AUTH_CONFIG` env variable. I think we can merge this to develop and pack into release...

By the way, it looks like I tested not the same code as this PR produces. That's why we have conflict

Oh, I see, you made some further changes. Do you want me to repeat them in my code, or you will just close the PR?

Hi @HofmeisterAn Please let me know when you plan to publish the release version containing this feature? It's quite strange to use the beta version of package in production environment...