Added GHA dependabot config for managing hashicorp actions (#194)

* Added GHA dependabot config for managing hashicorp actions

* Update dependabot.yml

.github/dependabot.yml

@@ -6,3 +6,10 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    # TODO: Dependabot only updates hashicorp GHAs in the template repository, the following lines can be removed for consumers of this template
+    allow:
+      - dependency-name: "hashicorp/*"