Update dependabot (argoproj-labs#775)

Signed-off-by: junhyungjang <[email protected]>

Author: JunHyungJang

.github/dependabot.yml

@@ -0,0 +1,28 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+    ignore:
+      - dependency-name: k8s.io/*
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+  - package-ecosystem: "docker"
+    directory: "/test/e2e/containers"
+    schedule:
+      interval: "monthly"
+
+  - package-ecosystem: "docker"
+    directory: "/test/e2e/images/test-image"
+    schedule:
+      interval: "monthly"
+