[k3s module] Access Host and another Container in the subnet

[bademux]

Hi, looks like i need help with k3s module networking
Assuming we run DB and k3s in the same network like:

    @AutoCleanup
    PostgreSQLContainer db = new PostgreSQLContainer(DockerImageName.parse('postgres:11'))
            .withNetwork(Network.newNetwork()).withNetworkAliases('db')
            .with(true, GenericContainer::start)

    @AutoCleanup
    K3sContainer k3s = new K3sContainer(DockerImageName.parse('rancher/k3s:v1.20.15-k3s1'))
            .withNetwork(db.network)
            .with(true, GenericContainer::start)

How I configure my application deployed in k3s to access:

1. Database. For "standalone" container I would normally use 'db' alias.
2. Host machine. For "standalone" container I would normally use host.testcontainers.internal, but it not work with k3s

How do do it for k3s?

[bademux]

Cast @rnorth . Sorry for disturbing you, could you please help me with accessing host machine/another container from k3s.
Thanks!