feat: Test ITF QEMU plugin with Ubuntu image

[lurtz]

Ubuntu is a popular Linux distribution, and it is useful to be able to run integration tests on it.

Next PR will take care of copying data onto the QEMU images: elektrobit-contrib#2. This code is used / tested at eclipse-score/inc_someip_gateway#177

[Copilot]

Pull request overview

Adds a new Ubuntu (x86_64) QEMU image build flow and a basic connectivity test to validate the ITF QEMU plugin against an Ubuntu cloud image, alongside refactoring the existing Ebclfsa image build into shared scripts.

Changes:

• Introduces Bazel resources + a genrule to build a customized Ubuntu 24.04 minimal cloud image for QEMU-based ITF integration tests.
• Adds a reusable ping integration test and wires it up for both Ebclfsa (aarch64) and Ubuntu (x86_64) QEMU targets.
• Adds/exports image build helper scripts (Ubuntu + Ebclfsa) and updates docs, CI dependencies, and Bazel module downloads accordingly.

Reviewed changes

Copilot reviewed 12 out of 14 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/resources/ubuntu_x86_64/qemu_config.json	Adds QEMU runtime configuration for the Ubuntu x86_64 target (network/CPU/RAM/machine).
test/resources/ubuntu_x86_64/cloud-init/user-data	Cloud-init template to configure networking + SSH access for the Ubuntu test image.
test/resources/ubuntu_x86_64/cloud-init/meta-data	Cloud-init metadata for the NoCloud seed used during the one-time customization boot.
test/resources/ubuntu_x86_64/BUILD	Bazel genrule/filegroups to build and expose the Ubuntu ITF-ready QEMU rootfs image.
test/resources/ebclfsa_aarch64/BUILD	Switches the Ebclfsa image build genrule to a shared script under //scripts.
test/integration/test_ping.py	Adds a shared ping-based integration test for QEMU targets.
test/integration/BUILD	Reuses test_ping.py for Ebclfsa and adds a new Ubuntu ping test target and suite membership.
scripts/render_user_data.py	Renders cloud-init user-data by injecting IP/gateway from qemu_config.json.
scripts/build_ubuntu_x86_64_image.sh	Builds a customized Ubuntu cloud image via a one-time QEMU + cloud-init boot.
scripts/build_ebclfsa_aarch64_image.sh	Shared Ebclfsa image customization/deployment helper script.
scripts/BUILD	Exports the new scripts so they can be referenced from Bazel rules.
README.md	Documents Linux QEMU image build flows and updates the QEMU test invocation example.
MODULE.bazel	Adds a pinned Ubuntu 24.04 minimal cloud image download for reproducible Bazel builds.
.github/workflows/itf.yml	Updates CI dependencies to include x86 QEMU and cloud image utilities.

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[ltekieli]

Image builds are out of scope of ITF.

[lurtz]

@ltekieli Do we already have a repo where I can put the build scripts?

[ltekieli]

I thoguht this one? https://github.com/eclipse-score/os_images

In general ITF should receive generic code that can be used across all possible usages. Plugins specific to a particular image implementation should live close to this image or it's usage. When external plugins mature, the generic parts should be extracted and can be put to ITF repo.