HYPERFLEET-1095 - chore: add renovate.json to fix broken MintMaker PRs

Disables broken Go module digest updates, disables unnecessary indirect
dependency updates, groups minor/patch updates into single PRs, and
schedules all updates to run weekly on Mondays.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: ciaranRoche

renovate.json

@@ -0,0 +1,25 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "schedule": ["every monday"],
+  "packageRules": [
+    {
+      "matchManagers": ["gomod"],
+      "matchUpdateTypes": ["digest"],
+      "enabled": false
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchDepTypes": ["indirect"],
+      "enabled": false
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "go module minor/patch updates"
+    },
+    {
+      "matchManagers": ["dockerfile"],
+      "groupName": "docker image updates"
+    }
+  ]
+}