feat: add renovate tests and more rules

[ledif]

Continuation of #53. This PR adds new renovate rules for the following packages:

• fwupd
• topgrade
• sched-ext/scx

This PR also includes a test written in Python and a justfile driver that runs the test in a container using podman.

The test works by rolling back versions of packages to known old versions and confirming that renovate finds an update for each package.

Manually running test

Test machine

State: idle
Deployments:
● ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
                   Digest: sha256:6983413a64089ba365765c4da1e6b167230b97b61d2c884acfa9fc8e580e7f23
                  Version: 41.20241125 (2024-11-26T03:52:52Z)
          LayeredPackages: coolercontrol liquidctl sunshine

Output

> cd .github/test/renovate
> just test-local
Working in /tmp/tmp.05hOoHFF9D
DEBUG: Using RE2 regex engine
DEBUG: Parsing configs
DEBUG: Checking for config file in /usr/src/app/.github/renovate.json5
DEBUG: File config

[... snip ...]

DEBUG: Checking file package cache for expired items
DEBUG: Deleted 0 of 0 file cached entries in 3ms
Packages with updates:
{'sched-ext/scx', 'fwupd', 'kf6-kio', 'loft-sh/devpod', 'topgrade-rs/topgrade'}
passed

[ledif]

@castrojo This should be ready for review now. Not sure if I need to address the Codacy issue (or exactly why it's complaining).