ci(renovate): Add initial renovate config

renovate.json

+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    "docker:enableMajor",
+    ":disableDependencyDashboard",
+    ":prHourlyLimitNone"
+  ],
+  "prConcurrentLimit": 10,
+  "semanticCommits": "enabled",
+  "regexManagers": [
+    {
+      "fileMatch": ["release.yaml$"],
+      "matchStrings": [
+        "# renovate: helmRepo=(?<registryUrl>.*?) depName=(?<depName>.*?)\\n\\s+version: \"?'?(?<currentValue>[^\"]+?)\"?'?"
+      ],
+      datasourceTemplate: "helm",
+      versioningTemplate: "semver"
+    }
+  ]
+}