inttest/cli: test with systemd based docker image

[ncopa]

Description

Add Ubuntu image for bootloose so we can test that k0s install/start/stop works with systemd units.

ref: #7053

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

• Manual test
• Auto test added

Checklist

• My code follows the style guidelines of this project
• My commit messages are signed-off
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[twz123]

Phew, a big change for just testing systemctl start/stop wrappers.

[kke]

Bootloose's own debian image has systemd?

[ncopa]

Its now based on bootloose image

[Copilot]

Pull request overview

Adds a systemd-based bootloose test image and a new LaunchModeSystemd path so the CLI integration tests can exercise k0s install/start/stop via systemd units (as a complement to the existing OpenRC/alpine coverage).

Changes:

• Add bootloose-systemd Docker image build + assets (systemd unit, nginx config, troubleshoot bundle config).
• Add LaunchModeSystemd and a systemdLaunchDelegate to start/stop k0s via systemctl and collect logs via journalctl.
• Split CLI inttest flow to run an install/start/stop smoke test for both the existing suite and a new systemd-based suite.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
inttest/Makefile	Adds a build stamp + target dependency to build the new bootloose-systemd image for check-cli.
inttest/common/launchdelegate.go	Introduces LaunchModeSystemd and a systemdLaunchDelegate that manages k0s via systemd units.
inttest/common/bootloosesuite.go	Wires LaunchModeSystemd into BootlooseSuite’s delegate selection.
inttest/cli/cli_test.go	Refactors CLI flow and adds a new systemd-based CLI suite.
inttest/bootloose-systemd/root/usr/local/bin/troubleshoot-k0s-inttest.sh	Adds support-bundle collection script for the systemd image.
inttest/bootloose-systemd/root/etc/troubleshoot/k0s-inttest.yaml	Adds troubleshoot support-bundle spec for systemd image.
inttest/bootloose-systemd/root/etc/systemd/system/k0s-seed.service	Adds systemd unit intended to seed /usr/local/bin/k0s from /dist/k0s.
inttest/bootloose-systemd/root/etc/nginx/sites-available/default	Adds nginx default site config (mirrors alpine image behavior).
inttest/bootloose-systemd/Dockerfile	Defines the new systemd-based bootloose image and installs required tooling (systemd, ssh, nginx, helm, troubleshoot, etc.).

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[ncopa]

Phew, a big change for just testing systemctl start/stop wrappers.

This also give us the ability to test anything on systemd if ever needed. We could for example add tests to verify that the cgroups are handled as expected on systemd.