adds renovate support (#8)

#### 📖 Summary

- testing renovate support with gitea-actions

#### 📑 Test Plan

> 💡 Select your test plan for the code changes.

- [x] CI pipeline tests
- [ ] Custom test
- [ ] No test plan

##### Details / Justification

<!-- Add your test details or justification for missing tests here. -->

#### 📚 Additional Notes

<!-- A place for additional detail notes. -->

Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: #8

renovate.json

@@ -0,0 +1,12 @@
+{
+  "dependencyDashboard": true,
+  "docker": {
+    "enabled": true
+  },
+  "github-actions": {
+    "enabled": true,
+    "fileMatch": [
+      "^\\.gitea/workflows/[^/]+\\.ya?ml$"
+    ]
+  }
+}