.github: add dependabot config

Add basic dependabot config to check for actions / npm updates daily.
This mirrors the config we currently have in the terraform provider repo
but with go swapped for npm.

Fixes #207

Signed-off-by: Mario Minardi <mario@tailscale.com>

Author: mpminardi

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    schedule:
+      interval: daily
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: daily