docker updates in dependabot

Author: Josh Ault

.github/dependabot.yml

@@ -1,8 +1,3 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
   - package-ecosystem: gomod
@@ -21,3 +16,11 @@ updates:
       - jault3
     reviewers:
       - jault3
+  - package-ecosystem: docker
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    assignees:
+      - jault3
+    reviewers:
+      - jault3