Merge pull request #60 from BirdeeHub/ci

ci(dependabot): use dependabot for nix flake update

Author: BirdeeHub

.github/dependabot.yml

@@ -5,3 +5,7 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+  - package-ecosystem: "nix"
+    directory: "/"
+    schedule:
+      interval: "weekly"