[artemiscloud#38] Add dependabot file

Use github dependabot to check dependency updates on github actions

Signed-off-by: Tiago Bueno <49003339+tlbueno@users.noreply.github.com>

.github/dependabot.yml

@@ -0,0 +1,14 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # See documentation for possible values
+    directory: "/" # Location of package manifests
+    schedule:
+      # weekly runs on mondays
+      # monthly runs on 1st day of the month
+      interval: "weekly"
+