feat(tool): Generate dependabot config

Signed-off-by: jld3103 <jld3103yt@gmail.com>

tool/generate-dependabot.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+set -euxo pipefail
+cd "$(dirname "$0")/.."
+
+output="version: 2
+updates:"
+
+function add_update() {
+  package_ecosystem="$1"
+  path="$2"
+
+  output+="
+  - package-ecosystem: \"$package_ecosystem\"
+    directory: \"$path\"
+    schedule:
+      interval: \"daily\"
+    labels:
+      - \"dependencies\""
+}
+
+add_update github-actions /
+add_update gradle /packages/app/android
+for path in $(melos list --relative --parsable); do
+  add_update pub "/$path"
+done
+
+echo "$output" > .github/dependabot.yml