chore(tools): add docker to the dependencies checked by dependabot

.github/dependabot.yaml

@@ -1,9 +1,23 @@
 version: 2
-updates:
+registries:
+  ghcr-io: # Define access for a private registry
+    type: docker-registry
+    url: ghcr.io
+    username: ${{secrets.BOT_USERNAME}}
+    password: ${{secrets.BOT_TOKEN}}
 
+updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       # Check for updates to GitHub Actions every sunday
       interval: "weekly"
       day: "sunday"
+
+  - package-ecosystem: "docker"
+    directory: "/docker"
+    registries:
+      - ghcr-io # Allow version updates for dependencies in this registry
+    schedule:
+      interval: "weekly"
+      day: "sunday"