fix: Use the actual Docker endpoint to extract the socket path for the Resource Reaper

[HofmeisterAn]

What does this PR do?

Instead of relying on the automatically discovered Docker endpoint to retrieve the Docker socket, the pull request utilizes the actual Docker endpoint. If the auto-discovery mechanism fails to detect a Docker endpoint and the user manually configures the Docker endpoint using the builder API, Testcontainers will encounter a null reference exception during runtime.

Why is it important?

The fix is significant because it allows the support of test environments where the auto-discovery mechanism cannot detect a Docker endpoint (although this is not recommended).

Related issues

• Closes [Bug]: If you want a remote host from windows it will fail with a null reference exception #929

How to test this PR

@paule96 Would it be possible for you to test the fix and see if it resolves the issue? It is a bit challenging to set up a test in CI due to the required remote Docker endpoint, etc.

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[paule96]

@HofmeisterAn is there some PR packages that I can use? Or do I need to download the branch source code and build it by myself? I can try to do it today or tomorrow depends on a bit of my calendrer.

[paule96]

this fix works for me.

Maybe an important side note:

In the issue to this PR you recommended to set DOCKER_HOST to some value, this didn't helped.

[HofmeisterAn]

@HofmeisterAn is there some PR packages that I can use? Or do I need to download the branch source code and build it by myself? I can try to do it today or tomorrow depends on a bit of my calendrer.

Unfortunately, there is no NuGet package. You need to checkout the branch.

[paule96]

yeah I did it like that now because I had a bit of time. lgtm 👍