Added renovate configuration targeting both develop branches

Author: michalChrobot

.github/renovate.json5

@@ -0,0 +1,38 @@
+{
+  "baseBranches": ["develop", "develop-2.0.0"],
+  
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "local>unity/renovate-config"
+  ],
+  "prConcurrentLimit": 100,
+  // Ignore commits produced by github actions workflows
+  "gitIgnoredAuthors": ["githubaction@githubaction.com"],
+  "ignorePaths": [
+    "**/node_modules/**",
+    // Don't renovate files in special folders using ~ as suffix
+    "**/*~/**"
+  ],
+  "packageRules": [
+
+    // Run unity-upm-project and unity-upm-package only on weekends to reduce PR noise
+    // Also ensure dependencies won't be downgraded when they don't exist in the public repositories
+    {
+      "matchManagers": [
+        "unity-upm-project",
+        "unity-upm-package"
+      ],
+      "enabled": "true",
+      "schedule": [
+        "every weekend"
+      ],
+      "rollbackPrs": false
+    },
+
+    // Enable automerge for Bokken image updates
+    {
+      "matchDatasources": ["unity-bokken"],
+      "automerge": false,
+    },
+  ],
+}