Mirgation to Bazel

[brobusta]

Hello,

I've been working on a fork of aktualizr to enable building it with Bazel. Most of the code and tests have been successfully migrated and are running stably, with the exception of the ostree-related code. Dependencies have been updated to their latest versions and are being automatically managed using Renovate.

The goal of this project is to modernize the codebase and make it easier to maintain. Once the migration is complete, I plan to submit MRs to the upstream repository. I'd love to hear your thoughts on this approach.

[cajun-rat]

Interesting, thank you for getting involved!

I looked through your current set of changes. They look pretty sensible to me overall. There are a few parts in there (like the switch to spdlog) that should be split out as part of the review process.

We'd certainly need to keep the existing cmake build system functional--there are downstream users that rely on it. What are you using Aktualizr for? bazel isn't all that common in the embedded world, and I'm interested why your use case needs bazel and not cmake.