Ability to set the host gateway for k8s devcontainer

[Baachi]

Description

Heyho!

We are building our own Kubernetes operator based on the Java operator SDK and quarkus. To test our operator works, we are writing Junit tests. The application deployed through our cluster needs a MongoDB database, which the operator creates and passes the credentials to. So, in our test setup, we need the operator to be able to communicate with MongoDB, and the container deployed in k3s can access the MongoDB container. Currently, we set it to host.docker.internal which works fine for MacOS and Windows but not on Linux since on Linux, the k3s container needs to be added via "--add-host".

Implementation ideas

Implement a new configuration option "quarkus.kubernetes-client.devservices.hosts" which is getting passed to GenericContainer::withExtraHost.

[quarkus-bot]

/cc @geoand (kubernetes), @iocanel (kubernetes)

[geoand]

cc @metacosm

[metacosm]

Out of curiosity, are you using the Quarkus extension for the Java Operator SDK?

[Baachi]

Exactly, we are using this extension.