chore: Configure Renovate (#30)

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

 * `Dockerfile` (dockerfile)
 * `.gitea/workflows/cd.yaml` (github-actions)
 * `.gitea/workflows/ci.yaml` (github-actions)
 * `go.mod` (gomod)

### What to Expect

With your current configuration, Renovate will create 5 Pull Requests:

<details>
<summary>chore(deps): update golang docker tag to v1.24</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/golang-1.x`
  - Merge into: `main`
  - Upgrade golang to `1.24-alpine`

</details>

<details>
<summary>chore(deps): update docker/build-push-action action to v6</summary>

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

</details>

<details>
<summary>chore(deps): update docker/login-action action to v3</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/docker-login-action-3.x`
  - Merge into: `main`
  - Upgrade [docker/login-action](https://github.com/docker/login-action) to `v3`

</details>

<details>
<summary>chore(deps): update docker/setup-buildx-action action to v3</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/docker-setup-buildx-action-3.x`
  - Merge into: `main`
  - Upgrade [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) to `v3`

</details>

<details>
<summary>chore(deps): update module github.com/go-co-op/gocron to v2</summary>

  - Schedule: ["at any time"]
  - Branch name: `renovate/github.com-go-co-op-gocron-2.x`
  - Merge into: `main`
  - Upgrade [github.com/go-co-op/gocron](https://github.com/go-co-op/gocron) to `v2.16.1`

</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).

---

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: #30
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

.gitea/workflows/cd.yaml

@@ -9,6 +9,27 @@ env:
   DOCKER_REGISTRY: gitea.t000-n.de
 
 jobs:
+  check-changes:
+    name: Check changes
+    runs-on: ubuntu-latest
+    outputs:
+      changes: ${{ steps.filter.outputs.code }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Get changes
+        id: filter
+        uses: dorny/paths-filter@v3
+        with:
+          filters: |
+            code:
+              - 'go.mod'
+              - 'go.sum'
+              - '**/*.go'
+              - 'config.example.yaml'
+              - 'Dockerfile'
+              - 'Makefile'
+
   test:
     name: test
     runs-on: ubuntu-latest
@@ -49,6 +70,8 @@ jobs:
         arch: [amd64, arm64]
     needs:
       - test
+      - check-changes
+    if: ${{ needs.check-changes.outputs.code == 'true' }}
     runs-on:
       - ubuntu-latest
       - linux_${{ matrix.arch }}