chore(renovate): move renovate file into place and customize for repo

renovate.json5

@@ -0,0 +1,39 @@
+{
+  "extends": [
+    "config:base"
+  ],
+  "packageRules": [
+    {
+      "matchManagers": ["nix"],
+      "matchPaths": ["**/flake.nix", "**/default.nix"],
+      "enabled": true
+    },
+    {
+      "matchManagers": ["gomod"],
+      "matchPaths": ["**/go.mod"],
+      "enabled": true,
+      "additionalBranchPrefix": "gomod-",
+      "schedule": ["at any time"]
+    },
+    {
+      "matchManagers": ["github-actions"],
+      "enabled": true
+    },
+    {
+      "matchManagers": ["dockerfile"],
+      "matchPaths": ["**/Dockerfile"],
+      "enabled": true
+    },
+    {
+      "matchManagers": ["json"],
+      "matchPaths": ["**/*.json", "**/*.json5"],
+      "enabled": true
+    }
+  ],
+  "timezone": "UTC",
+  "schedule": ["before 6am on Monday"],
+  "dependencyDashboard": true,
+  "labels": ["dependencies"],
+  "branchConcurrentLimit": 5,
+  "prConcurrentLimit": 5
+}