Add woodpecker manager in renovate-bot (#14)

#### 📖 Summary

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#### 📑 Test Plan

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- [ ] Tested via Drone.io pipeline
- [ ] Custom test
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##### Details / Justification

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Co-authored-by: OCram85 <marco.blessing@googlemail.com>
Reviewed-on: CodeServer/Container#14

renovate.json

@@ -2,5 +2,11 @@
   "dependencyDashboard": true,
   "docker": {
     "enabled": true
+  },
+  "woodpecker": {
+    "enabled": true,
+    "fileMatch": [
+      "^.woodpecker/*.yml$"
+    ]
   }
 }