GitHub: Improve Dependabot. (#12033)

.github/dependabot.yml

@@ -1,33 +1,7 @@
----
 version: 2
 updates:
-  - package-ecosystem: "gomod"
-    directory: "/"
-    schedule:
-      interval: "weekly"
-    labels:
-      - "area/dependency"
-      - "release-note-none"
-      - "ok-to-test"
-    groups:
-      all:
-        update-types:
-          - "patch"
   - package-ecosystem: "github-actions"
     directory: "/"
-    schedule:
-      interval: "weekly"
-    labels:
-      - "area/dependency"
-      - "release-note-none"
-      - "ok-to-test"
-    groups:
-      all:
-        update-types:
-          - "minor"
-          - "patch"
-  - package-ecosystem: "docker"
-    directory: "/images"
     schedule:
       interval: "weekly"
     labels:
@@ -39,3 +13,31 @@ updates:
         update-types:
           - "minor"
           - "patch"
+  - package-ecosystem: "docker"
+    directories:
+      - "**/rootfs"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "area/dependency"
+      - "release-note-none"
+      - "ok-to-test"
+    groups:
+      docker:
+        update-types:
+          - "minor"
+          - "patch"
+  - package-ecosystem: "gomod"
+    directories:
+      - "/"
+      - "**/rootfs"
+    schedule:
+      interval: "weekly"
+    labels:
+      - "area/dependency"
+      - "release-note-none"
+      - "ok-to-test"
+    groups:
+      go:
+        update-types:
+          - "patch"