chore: Configure Renovate (#3)

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.

---
### Detected Package Files

 * `targets/forgejo/docker-compose.yml` (docker-compose)
 * `targets/gotosocial/docker-compose.yaml` (docker-compose)

### Configuration Summary

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

  - Start dependency updates only once this onboarding PR is merged
  - 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 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.
  - Enable Renovate Dependency Dashboard creation.

🔡 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.

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### What to Expect

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

<details>
<summary>chore(deps): update codeberg.org/forgejo/forgejo docker tag to v1.21</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/codeberg.org-forgejo-forgejo-1.x`
  - Merge into: `master`
  - Upgrade [codeberg.org/forgejo/forgejo](https://codeberg.org/forgejo/forgejo) to `1.21`

</details>

<details>
<summary>chore(deps): update codeberg.org/forgejo/forgejo docker tag to v7</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/codeberg.org-forgejo-forgejo-7.x`
  - Merge into: `master`
  - Upgrade [codeberg.org/forgejo/forgejo](https://codeberg.org/forgejo/forgejo) to `7.0`

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

---

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

<!--renovate-config-hash:388f0426bb11a51b7bc01c1d8659c05ffc5d272c9b8aa8a8bdffc0dd2574fce7-->

Co-authored-by: Renovate Bot <renovate-bot@git.batesnse.net>
Reviewed-on: #3
Co-authored-by: Renovate Bot <renovate-bot@git.batsense.net>
Co-committed-by: Renovate Bot <renovate-bot@git.batsense.net>

renovate.json

@@ -0,0 +1,21 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended",
+    ":dependencyDashboard"
+  ],
+  "labels": [
+    "renovate-bot"
+  ],
+  "prHourlyLimit": 0,
+  "timezone": "Asia/kolkata",
+  "prCreation": "immediate",
+  "vulnerabilityAlerts": {
+    "enabled": true,
+    "labels": [
+      "renovate-bot",
+      "renovate-security",
+      "security"
+    ]
+  }
+}