Ryuk is inaccessible when tests are run inside a network

[michivi]

The Ryuk container is inaccessible by testcontainers-hs when it is run inside a Docker container, itself running in a network different from the default one.

The tested scenario is:

• The testing code is run inside a container, in a dedicated network
• The testing code spawns a testcontainer with a dedicated network (different from the previous one, but the issue also occurs within the same network). As a result, a Ryuk container is spawned for it. But it is so in the default Docker network.
• When attempting to contact Ryuk, testcontainers cannot find the dedicated alias, and fails.

This scenario can be encountered when running tests on GitHub Actions within a container.

In such a scenario, the following message is printed:

       uncaught exception: DockerException
       InspectOutputMissingNetwork {id = "cb9daeaca3[...]37bd2490"}

Whenever testcontainers-hs is run inside a container in a network different from the default one, then Ryuk cannot be accessed directly. It needs to access Ryuk using the mapped port on the host.

• Tested version: 0.5.0.0
• Environment: GitHub Actions, code running inside a Docker container