feat: add GitHub Actions workflows for code quality and automation (#2)

.github/renovate.json

@@ -1,6 +1,20 @@
 {
-    "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-    "extends": [
-        "github>ivuorinen/renovate-config"
-    ]
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": ["github>ivuorinen/renovate-config"],
+  "packageRules": [
+    {
+      "matchUpdateTypes": ["minor", "patch"],
+      "matchCurrentVersion": "!/^0/",
+      "automerge": true
+    },
+    {
+      "matchDepTypes": ["devDependencies"],
+      "automerge": true
+    }
+  ],
+  "schedule": ["every weekend"],
+  "vulnerabilityAlerts": {
+    "labels": ["security"],
+    "assignees": ["ivuorinen"]
+  }
 }