Use dependabot for dependency checks on npm and Dockerfile

Change-Id: I5f757f6352b9d4002860ac2896f58210d101b278
diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..96e786d
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+version: 2
+updates:
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    open-pull-requests-limit: 50
+  - package-ecosystem: 'npm'
+    directory: '/'
+    schedule:
+      interval: 'daily'
+    open-pull-requests-limit: 50