Add hostname propagation to ironcore-net NetworkInterfaces

[ushabelgur]

Proposed Changes

• Pass machineName as hostaname to ironcore-net NetworkInterfaces while creating machine
• Update testcase
• Update ironcore-net dependency

Fixes #538

Summary by CodeRabbit

Release Notes

• New Features
  • Machine specifications now include a name attribute, allowing machines to be identified and referenced by name.
  • Network interfaces now support hostname configuration, automatically assigned from the machine name.

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[coderabbitai]

Walkthrough

The changes add hostname propagation to the machine networking stack. A new Name field is introduced to the MachineSpec in the API, populated from the machine's metadata ID during creation, and subsequently propagated to the ironcore-net NetworkInterface as the Hostname field through the apinet plugin. Supporting dependency is updated.

Changes

Cohort / File(s)	Summary
API & Core api/machine.go	Added public Name field to MachineSpec struct with JSON tag for serialization.
Dependency Management go.mod	Updated github.com/ironcore-dev/ironcore-net from v0.2.4 to v0.2.5-0.20260123094402-a0b32fb0e8ff.
Network Plugin Integration internal/plugins/networkinterface/apinet/apinet.go	Added Hostname field population in NetworkInterfaceSpec construction, deriving value from machine.Spec.Name.
Server Machine Creation internal/server/machine_create.go	Populated Name field in machine spec assignment using iriMachine.Metadata.Id.
Test Updates internal/server/machine_create_test.go	Added Id field assignment to Machine.Metadata.ObjectMetadata for test fixture setup.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main change: adding hostname propagation to ironcore-net NetworkInterfaces.
Description check	✅ Passed	The description covers all three main changes and references the linked issue, though it uses the template structure with bullet points as required.
Linked Issues check	✅ Passed	All objectives from issue #538 are met: hostname field is added to NetworkInterface, test suite is extended, and implementation propagates machine name as hostname.
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue objectives: adding Name field to MachineSpec, propagating it as hostname to NetworkInterface, updating tests, and updating the dependency.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

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