infra: added Renovate bot

renovate.json

@@ -0,0 +1,28 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    ":disableRateLimiting",
+    ":semanticCommits"
+  ],
+  "labels": ["dependencies", "renovate"],
+
+  "packageRules": [
+    {
+      "matchLanguages": ["python"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "all non-major python dependencies",
+      "groupSlug": "all-minor-patch-python"
+    }
+  ],
+
+  "regexManagers": [
+    {
+      "description": "Update Docker variables in the Makefile",
+      "fileMatch": ["^Makefile$"],
+      "matchStrings": [
+        "# renovate: datasource=(?<datasource>.*?) depName=(?<depName>.*?)( versioning=(?<versioning>.*?))?\\s[A-Z_]+_VERSION [?:]?= (?<currentValue>.*)"
+      ]
+    }
+  ]
+}