chore: Update Renovate config (#32)

Signed-off-by: Ian Lewis <[email protected]>

renovate.json

@@ -1,6 +1,31 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "extends": [
-    "config:base"
+  "extends": ["config:base", ":gitSignOff"],
+  "schedule": ["before 3am on the first day of the month"],
+  "extends": ["config:base"],
+  "packageRules": [
+    {
+      "matchManagers": ["github-actions"],
+      "excludePackageNames": ["slsa-framework/slsa-github-generator"],
+      "groupName": "github-actions",
+      "pinDigests": true
+    },
+    {
+      "matchManagers": ["github-actions"],
+      "matchPackageNames": ["slsa-framework/slsa-github-generator"],
+      "groupName": "github-actions",
+      "pinDigests": false
+    },
+    {
+      "matchManagers": ["npm"],
+      "matchDepTypes": ["dependencies"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "npm"
+    },
+    {
+      "matchManagers": ["npm"],
+      "matchDepTypes": ["devDependencies"],
+      "groupName": "npm dev"
+    }
   ]
 }