chore: Configure Renovate (#13)

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

 * `apt-mirror/Dockerfile` (dockerfile)
 * `bind/Dockerfile` (dockerfile)
 * `consul/Dockerfile` (dockerfile)
 * `goaccess/Dockerfile` (dockerfile)
 * `grunt/Dockerfile` (dockerfile)
 * `grunt/runtime/Dockerfile` (dockerfile)
 * `haproxy/Dockerfile` (dockerfile)
 * `icecast/Dockerfile` (dockerfile)
 * `jq/Dockerfile` (dockerfile)
 * `liquidsoap/Dockerfile` (dockerfile)
 * `memcached/Dockerfile` (dockerfile)
 * `nginx-geoip2/Dockerfile` (dockerfile)
 * `nginx-http2/Dockerfile` (dockerfile)
 * `nginx-rtmp/Dockerfile` (dockerfile)
 * `nginx/Dockerfile` (dockerfile)
 * `pg/Dockerfile` (dockerfile)
 * `powerdns/Dockerfile` (dockerfile)
 * `rails/Dockerfile` (dockerfile)
 * `redis/Dockerfile` (dockerfile)
 * `rsyslog/Dockerfile` (dockerfile)
 * `swarm/Dockerfile` (dockerfile)
 * `vault/Dockerfile` (dockerfile)

### 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.

🔡 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 2 Pull Requests:

<details>
<summary>chore(deps): update alpine docker tag to v3.21</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/alpine-3.x`
  - Merge into: `master`
  - Upgrade alpine to `3.21`


</details>

<details>
<summary>chore(deps): update ubuntu docker tag to v24</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/ubuntu-24.x`
  - Merge into: `master`
  - Upgrade ubuntu to `noble`


</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/voxxit/dockerfiles).


<!--renovate-config-hash:e80b4e42a3043bc12fa0640db4bac392d2bf770acf841360d7c8ceeeac2ec1a9-->

Author: voxxit

renovate.json

@@ -0,0 +1,6 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ]
+}