Add dependabot configuration

Author: nguereza-tony

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+updates:
+    # Maintain dependencies for GitHub Actions.
+    - package-ecosystem: "github-actions"
+      directory: "/"
+      schedule:
+          interval: "daily"
+      # Too noisy. See https://github.community/t/increase-if-necessary-for-github-actions-in-dependabot/179581
+      open-pull-requests-limit: 0
+
+    # Maintain dependencies for Composer
+    - package-ecosystem: "composer"
+      directory: "/"
+      schedule:
+          interval: "daily"
+      versioning-strategy: increase-if-necessary