ci: add groups for dependabot

Signed-off-by: Nikita Pivkin <[email protected]>

.github/dependabot.yml

@@ -5,7 +5,23 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    ignore:
+      - dependency-name: "github.com/aquasecurity/trivy-*" ## `trivy-*` dependencies are updated manually
+    groups:
+      docker:
+        patterns:
+          - "github.com/docker/*"
+      common:
+        exclude-patterns:
+          - "github.com/aquasecurity/trivy-*"
+        patterns:
+          - "*"
   - package-ecosystem: github-actions
     directory: /
     schedule:
       interval: "monthly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"
+