feat: add network driver options

[Wielewout]

What does this PR do?

Used the field Options in network.CreateOptions (docker). Also added a DriverOptions field to the (deprecated) NetworkRequest since we convert from CreateOptions to NetworkRequest and then back to CreateOptions in the docker provider.

Why is it important?

This gives more control over network creation.

For example it allows to set a container interface prefix with com.docker.network.container_iface_prefix. This can give stability to the interface names when needing to inject one in the config (before the container is running) when the container attaches to multiple networks. Without it there is no way of predicting which interface (eth0, eth1, ...) would correspond with which network.

Related issues

• Closes #3301

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[coderabbitai[bot]]

Summary by CodeRabbit

• New Features

  • Added support for specifying driver-specific options when creating networks, providing finer control over network behavior.

• Documentation

  • Updated networking documentation with guidance on configuring driver options during network creation, including usage examples.

Walkthrough

Adds support for network driver options by introducing WithDriverOptions(map[string]string), extending NetworkRequest with DriverOptions, documenting the option, and wiring these options into Docker network creation via the Options field.

Changes

Cohort / File(s)	Summary
Networking API updates network.go, network/network.go	Adds DriverOptions map[string]string to NetworkRequest. Introduces WithDriverOptions(options map[string]string) and maps options into NetworkRequest during New.
Docker integration docker.go	Passes driver options to Docker by assigning nc.Options from req.DriverOptions in CreateNetwork.
Documentation docs/features/networking.md	Documents the new WithDriverOptions(map[string]string) network option alongside existing customizers.

Sequence Diagram(s)

sequenceDiagram
  autonumber
  actor Dev as Developer
  participant NET as network.New
  participant Builder as NetworkRequest Builder
  participant DockerCli as Docker Client
  participant Engine as Docker Engine

  Dev->>NET: New(..., WithDriverOptions(map[string]string))
  NET->>Builder: Apply options
  Builder->>Builder: Set DriverOptions on NetworkRequest
  Builder->>DockerCli: CreateNetwork(req) with Options = DriverOptions
  DockerCli->>Engine: POST /networks/create { Options: {...} }
  Engine-->>DockerCli: NetworkID
  DockerCli-->>Dev: Result

  note over Builder,DockerCli: New/changed: propagate DriverOptions into Docker Options

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

I nudge the nets with careful hops,
A sprinkle of options, carrot-tops.
Drivers purr with tuned finesse,
Interfaces named, no random mess.
With tidy flags my whiskers twitch—
Networks spin up without a hitch. 🐇✨

Pre-merge checks and finishing touches

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title Check	✅ Passed	The title “feat: add network driver options” concisely and accurately summarizes the primary change introduced by the pull request, namely the addition of support for network driver options in Testcontainers. It clearly reflects the main feature without extraneous information or ambiguity, allowing a teammate to understand the intent at a glance.
Linked Issues Check	✅ Passed	The change set fully implements the objectives of issue #3301 by adding a WithDriverOptions network customizer, introducing the DriverOptions field on NetworkRequest, and mapping those options through CreateNetwork to Docker’s network creation API, thereby fulfilling the requested feature for driver-specific network options.
Out of Scope Changes Check	✅ Passed	All modifications in docker.go, network.go, network/network.go, and the documentation are directly related to introducing and supporting driver options and there are no unrelated or extraneous changes.
Description Check	✅ Passed	The pull request description directly explains the modifications made—using the Options field in network.CreateOptions and adding a DriverOptions field to NetworkRequest—along with the rationale for enabling custom driver options such as com.docker.network.container_iface_prefix. It stays on topic and aligns with the changes in the code.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

✨ Finishing touches

• [ ] 📝 Generate Docstrings

🧪 Generate unit tests

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment

[!TIP]

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[Wielewout]

LGTM! Before merging, I'd suggest we add a test for this, although the code is pretty simply: it just passes the options to the Docker type.

@mdelapenya The only way to test that I see currently is to use the driver option com.docker.network.container_iface_prefix to set a custom interface name (e.g. test_if). We then create a small go application which provides all the interface names over http (GET /interfaces) and put it in a container. If test_if0 is among the interface names, the test passes. Any thoughts?

(I'm not immediately sure when I'll find some time to try this out)