feat: migrate existing configs (#1)

Reviewed-on: #1
Reviewed-by: branch-buddy <branch-buddy@t00n.de>
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

docker-compose.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "docker-compose": {
+    "digest": {
+      "enabled": true
+    },
+    "addLabels": ["deps", "docker-compose"]
+  }
+}