Use regex to capture pocketbase version

renovate.json

@@ -2,5 +2,16 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "extends": [
     "local>hads/renovate-config"
+  ],
+  "regexManagers": [
+    {
+      "fileMatch": [
+        "(^|/)Dockerfile$",
+        "(^|/)Dockerfile\\.[^/]*$"
+      ],
+      "matchStrings": [
+        "#\\srenovate:\\sdatasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?( extractVersion=(?<extractVersion>.*?))?\\s(ENV|ARG) .*?_VERSION=(?<currentValue>.*)\\s"
+      ]
+    }
   ]
-}
+}