Update dependabot.yml

add docker to dependabot config

Author: jmeridth

.github/dependabot.yml

@@ -13,3 +13,15 @@ updates:
         update-types:
           - "minor"
           - "patch"
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    commit-message:
+      prefix: "chore(deps)"
+    groups:
+      dependencies:
+        applies-to: version-updates
+        update-types:
+          - "minor"
+          - "patch"