Add renovate configuration

Author: arturo-seijas

renovate.json

@@ -0,0 +1,32 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base"
+  ],
+  "regexManagers": [
+    {
+      "fileMatch": ["(^|/)rockcraft.yaml$"],
+      "description": "Update base image references",
+      "matchStringsStrategy": "any",
+      "matchStrings": ["# renovate: build-base:\\s+(?<depName>[^:]*):(?<currentValue>[^\\s@]*)(@(?<currentDigest>sha256:[0-9a-f]*))?",
+      "# renovate: base:\\s+(?<depName>[^:]*):(?<currentValue>[^\\s@]*)(@(?<currentDigest>sha256:[0-9a-f]*))?"],
+      "datasourceTemplate": "docker",
+      "versioningTemplate": "ubuntu"
+    }
+  ],
+  "packageRules": [
+    {
+      "enabled": true,
+      "matchDatasources": [
+        "docker"
+      ],
+      "pinDigests": true
+    },
+    {
+      "matchFiles": ["rockcraft.yaml"],
+      "matchUpdateTypes": ["major", "minor", "patch"],
+      "enabled": false
+    }
+  ]
+}
+