add dependabot support (#254)

Author: rahulait

.github/dependabot.yml

@@ -0,0 +1,38 @@
+version: 2
+updates:
+
+# Go - root directory
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    ## group all dependencies with a k8s.io prefix into a single PR.
+    groups:
+      kubernetes:
+        patterns: [ "k8s.io/*", "sigs.k8s.io/*" ]
+      otel:
+        patterns: ["go.opentelemetry.io/*"]
+    commit-message:
+      prefix: ":seedling:"
+    labels:
+      - "dependencies"
+
+# Docker
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: ":seedling:"
+    labels:
+      - "dependencies"
+
+# github-actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    commit-message:
+      prefix: ":seedling:"
+    labels:
+      - "dependencies"