chore: Configure Renovate (#11)

Welcome to [Renovate](https://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.

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### Detected Package Files

 * `.gitea/workflows/deploy.yaml` (github-actions)
 * `.gitea/workflows/validate.yaml` (github-actions)
 * `crowdsec/helmfile.yaml` (helmfile)

### What to Expect

With your current configuration, Renovate will create 2 Pull Requests:

<details>
<summary>chore(deps): update helm release crowdsec to v0.21.1</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/crowdsec-0.x`
  - Merge into: `main`
  - Upgrade [crowdsec](https://github.com/crowdsecurity/helm-charts) to `bed71079d69c52bd2d8442160adaa054259b2e1284c971c320661fc51bab44d3`

</details>

<details>
<summary>chore(deps): update actions/checkout action to v6</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/actions-checkout-6.x`
  - Merge into: `main`
  - Upgrade [actions/checkout](https://github.com/actions/checkout) to `v6`

</details>

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❓ 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://github.com/renovatebot/renovate/discussions).

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

<!--renovate-config-hash:94693a990c975907e7f13da3309b9d56ba02b3983519b41786edf5cf031e457c-->

Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Reviewed-on: #11
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

renovate.json

@@ -0,0 +1,19 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>t.behrendt/renovate-configs:common",
+    "local>t.behrendt/renovate-configs:k8s",
+    "local>t.behrendt/renovate-configs:action",
+    "local>t.behrendt/renovate-configs:helm"
+  ],
+  "kubernetes": {
+    "managerFilePatterns": [
+      "/^node-labels/.*\\.yaml$/",
+      "/^coredns/.*\\.yaml$/",
+      "/^traefik/.*\\.yaml$/"
+    ]
+  },
+  "helm-values": {
+    "managerFilePatterns": ["/(^|/)crowdsec/values.ya?ml$/"]
+  }
+}