WIP: Add TMT gating test and workflow for bootupd

[aaradhak]

Add TMT testing infrastructure including core smoke test with GitHub workflow integration.

[gemini-code-assist]

Summary of Changes

Hello @aaradhak, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request establishes a new, robust testing infrastructure for the bootupd project by integrating the Test Management Tool (TMT). It introduces a fundamental smoke test to confirm bootupd package installation and sets up a flexible test environment capable of handling bootupd binaries from either source builds or installed packages. This initiative significantly enhances the project's automated testing capabilities.

Highlights

• TMT Test Infrastructure: Introduces the Test Management Tool (TMT) framework to the project, laying the foundation for automated testing.
• Core Smoke Test: Adds a basic smoke test (tests/core/core.fmf) to verify the successful installation of the bootupd package.
• Flexible Test Environment Setup: Implements conditional prepare steps in tests/tmt/plans/main.fmf to support testing bootupd whether it's built from source or installed as a distribution package.
• TMT Smoke Plan: Defines a TMT plan (tests/tmt/plans/smoke.fmf) to discover and execute all tests tagged with 'smoke'.

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[gemini-code-assist]

Code Review

This pull request introduces TMT testing infrastructure for bootupd, including a core smoke test and a GitHub workflow. The changes are well-structured. I've found a couple of issues in the test preparation scripts: one related to the robustness of finding the bootupd binary when built from source, and a critical issue with an incorrect hardcoded path for the package-installed binary. Addressing these will improve the reliability of the new test suite.

[cgwalters]

I'm not opposed to this but it's also important to acknowledge that this is testing almost nothing.

As far as I understand without additional work, it will not be testing the source changes to the git repository here, only installing the existing package, which seems misleading at best.

I think what actually is solving that problem is packit which acts as a glue later on top of testing-farm/tmt to build rpms in a copr and then inject them by default.

But that gets to the next problem that doing useful bootupd testing requires being in a bootc/coreos system so we'd need to use e.g. https://tmt.readthedocs.io/en/1.42/plugins/provision.html#bootc

[cgwalters]

What defines use_built_from_src?