chore: Configure Renovate (#55)

Welcome to [Renovate](https://redirect.github.com/renovatebot/renovate)!
This is an onboarding PR to help you understand and configure settings
before regular Pull Requests begin.

🚦 To activate Renovate, merge this Pull Request. To disable Renovate,
simply close this Pull Request unmerged.



---
### Detected Package Files

 * `.github/workflows/ci.yml` (github-actions)
 * `pixi.toml` (pixi)

### Configuration Summary

Based on the default config's presets, Renovate will:

  - Start dependency updates only once this onboarding PR is merged
  - Hopefully safe environment variables to allow users to configure.
  - Show all Merge Confidence badges for pull requests.
  - Enable Renovate Dependency Dashboard creation.
- Use semantic commit type `fix` for dependencies and `chore` for all
others if semantic commits are in use.
- Ignore `node_modules`, `bower_components`, `vendor` and various
test/tests (except for nuget) directories.
  - Group known monorepo packages together.
  - Use curated list of recommended non-monorepo package groupings.
  - Apply crowd-sourced package replacement rules.
  - Apply crowd-sourced workarounds for known problems with packages.
  - Run lock file maintenance (updates) on the first day of each month.
  - Run Renovate on following schedule: on the 2nd day of the month

🔡 Do you want to change how Renovate upgrades your dependencies? Add
your custom config to `renovate.json` in this branch. Renovate will
update the Pull Request description the next time it runs.

---

### What to Expect

With your current configuration, Renovate will create 1 Pull Request:

<details>
<summary>chore(ci): Lock file maintenance Pixi</summary>

  - Schedule: ["* 0-3 1 * *"]
  - Branch name: `renovate/pixi`
  - Merge into: `main`
- Regenerate lock files to use latest dependency versions - Upgrade
[python](https://docs.python.org/devguide/) to `3.13.*`
- Upgrade [ruff](https://redirect.github.com/charliermarsh/ruff) to
`>=0.11.5,<0.12`


</details>


---

❓ Got questions? Check out Renovate's
[Docs](https://docs.renovatebot.com/), particularly the Getting Started
section.
If you need any further assistance then you can also [request help
here](https://redirect.github.com/renovatebot/renovate/discussions).


---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/prefix-dev/recipe-format).


<!--renovate-config-hash:6f4dcb982c4976c998cc7636e2c44311185db25466c6cb105ee9af3484702b39-->

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Julian Hofer <[email protected]>

Author: renovate[bot]

.github/dependabot.yml

@@ -0,0 +1,17 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["config:recommended", ":maintainLockFilesMonthly"],
+  "schedule": ["on the 2nd day of the month"],
+  "enabledManagers": ["github-actions", "pixi"],
+  "commitMessagePrefix": "chore(ci):",
+  "packageRules": [
+    {
+      "groupName": "GitHub Actions",
+      "matchManagers": ["github-actions"]
+    },
+    {
+      "groupName": "Pixi",
+      "matchManagers": ["pixi"]
+    }
+  ]
+}