workflow: enable dependabot

Signed-off-by: Maryam Tahhan <[email protected]>

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# Please see the documentation for all configuration options:
+# https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
+
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      day: monday
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"