Refactor Dockerfile ARG declarations for better organization and add renovate configuration for automated dependency updates

renovate.json

@@ -0,0 +1,16 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "customManagers": [
+    {
+      "customType": "regex",
+      "managerFilePatterns": ["/^Dockerfile$/", "/Dockerfile.*/"],
+      "matchStrings": [
+        "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)\\s+ARG .*?_VERSION=(?<currentValue>.*)\\s"
+      ],
+      "datasourceTemplate": "{{{datasource}}}"
+    }
+  ]
+}