Enable Dependabot for CI/CD workflow

Author: gobinathm

.github/dependabot.yml

@@ -0,0 +1,43 @@
+version: 2
+updates:
+  - package-ecosystem: "npm"
+    directory: "/frontend"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 5
+    rebase-strategy: "auto"
+    versioning-strategy: "increase"
+    commit-message:
+      prefix: "deps(frontend):"
+    labels:
+      - "dependencies"
+
+  - package-ecosystem: "nuget"
+    directory: "/backend"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 5
+    rebase-strategy: "auto"
+    versioning-strategy: "increase"
+    commit-message:
+      prefix: "deps(backend):"
+    labels:
+      - "dependencies"
+
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    open-pull-requests-limit: 5
+    labels:
+      - "dependencies"
+
+# Optional: ignore rules, approval/merge automation, or registry credentials can be added below.