chore(renovate): add config to detect all docker image references in values.yaml

Reviewed-on: #2

renovate.json

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>perso/renovate-config"
+  ],
+  "helmValues": {
+    "fileMatch": ["(^|/)values\\.ya?ml$"]
+  },
+  "customManagers": [
+    {
+      "customType": "regex",
+      "fileMatch": ["(^|/)values\\.ya?ml$"],
+      "matchStrings": [
+        "repository:\\s*(?<depName>[^\\s]+)\\s*\\n\\s*tag:\\s*(?<currentValue>[^\\s]+)"
+      ],
+      "datasourceTemplate": "docker",
+      "versioningTemplate": "docker"
+    }
+  ]
+}