Merge pull request #3477 from buildkite/split-dependabot-containers

Split Dependabot container updates

Author: DrJosh9000

.github/dependabot.yml

@@ -2,7 +2,6 @@ version: 2
 updates:
   - package-ecosystem: docker
     directories:
-      - /.buildkite
       - /packaging/docker/alpine
       - /packaging/docker/alpine-k8s
       - /packaging/docker/sidecar
@@ -15,6 +14,16 @@ updates:
       container-images:
         patterns:
           - "*"
+          
+  - package-ecosystem: docker
+    directories:
+      - /.buildkite
+    schedule:
+      interval: weekly
+    groups:
+      container-images:
+        patterns:
+          - "*"
 
   - package-ecosystem: gomod
     directory: /